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(3x+12)+(2x+3)=90
We move all terms to the left:
(3x+12)+(2x+3)-(90)=0
We get rid of parentheses
3x+2x+12+3-90=0
We add all the numbers together, and all the variables
5x-75=0
We move all terms containing x to the left, all other terms to the right
5x=75
x=75/5
x=15
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