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 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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