90+(4x+21)+(5x-12)=180

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Solution for 90+(4x+21)+(5x-12)=180 equation: 



90+(4x+21)+(5x-12)=180

We move all terms to the left:

90+(4x+21)+(5x-12)-(180)=0

We add all the numbers together, and all the variables

(4x+21)+(5x-12)-90=0

We get rid of parentheses

4x+5x+21-12-90=0

We add all the numbers together, and all the variables

9x-81=0

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

9x=81

x=81/9

x=9

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