(12x-9)+(2x+21)=90

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Solution for (12x-9)+(2x+21)=90 equation: 



(12x-9)+(2x+21)=90

We move all terms to the left:

(12x-9)+(2x+21)-(90)=0

We get rid of parentheses

12x+2x-9+21-90=0

We add all the numbers together, and all the variables

14x-78=0

We move all terms containing x to the left, all other terms to the right

14x=78

x=78/14

x=5+4/7

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