(x+12)+(3x-12)=90

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Solution for (x+12)+(3x-12)=90 equation: 



(x+12)+(3x-12)=90

We move all terms to the left:

(x+12)+(3x-12)-(90)=0

We get rid of parentheses

x+3x+12-12-90=0

We add all the numbers together, and all the variables

4x-90=0

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

4x=90

x=90/4

x=22+1/2

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