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Solve the inequality
Graph
$\dfrac { x } { 12 } + \dfrac { 20 - x } { 4 } \leq 3$
$\dfrac { x } { 12 } + \dfrac { 20 - x } { 4 } \leq 3$
Solution of inequality
$x \geq 12$
$\dfrac{ x }{ 12 } + \dfrac{ 20-x }{ 4 } \leq 3$
$x \geq 12$
 Solve a solution to $x$
$\dfrac { x } { 12 } + \dfrac { \color{#FF6800}{ 20 } \color{#FF6800}{ - } \color{#FF6800}{ x } } { 4 } \leq 3$
 Organize the expression 
$\dfrac { x } { 12 } + \dfrac { \color{#FF6800}{ - } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 20 } } { 4 } \leq 3$
$\color{#FF6800}{ \dfrac { x } { 12 } } \color{#FF6800}{ + } \color{#FF6800}{ \dfrac { - x + 20 } { 4 } } \leq \color{#FF6800}{ 3 }$
 Multiply both sides by the least common multiple for the denominators to eliminate the fraction 
$\color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 3 } \left ( \color{#FF6800}{ - } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 20 } \right ) \leq \color{#FF6800}{ 36 }$
$x + \color{#FF6800}{ 3 } \left ( \color{#FF6800}{ - } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 20 } \right ) \leq 36$
 Multiply each term in parentheses by $3$
$x \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ x } + \color{#FF6800}{ 3 } \color{#FF6800}{ \times } \color{#FF6800}{ 20 } \leq 36$
$x - 3 x + \color{#FF6800}{ 3 } \color{#FF6800}{ \times } \color{#FF6800}{ 20 } \leq 36$
 Multiply $3$ and $20$
$x - 3 x + \color{#FF6800}{ 60 } \leq 36$
$\color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 3 } \color{#FF6800}{ x } + 60 \leq 36$
 Calculate between similar terms 
$\color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } + 60 \leq 36$
$- 2 x \color{#FF6800}{ + } \color{#FF6800}{ 60 } \leq 36$
 Move the constant to the right side and change the sign 
$- 2 x \leq 36 \color{#FF6800}{ - } \color{#FF6800}{ 60 }$
$- 2 x \leq \color{#FF6800}{ 36 } \color{#FF6800}{ - } \color{#FF6800}{ 60 }$
 Subtract $60$ from $36$
$- 2 x \leq \color{#FF6800}{ - } \color{#FF6800}{ 24 }$
$\color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \leq \color{#FF6800}{ - } \color{#FF6800}{ 24 }$
 Change the symbol of the inequality of both sides, and reverse the symbol of the inequality to the opposite direction 
$2 x \geq 24$
$\color{#FF6800}{ 2 } \color{#FF6800}{ x } \geq \color{#FF6800}{ 24 }$
 Divide both sides by the same number 
$\color{#FF6800}{ x } \geq \color{#FF6800}{ 12 }$
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