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(5x)+(x+12)=90
We move all terms to the left:
(5x)+(x+12)-(90)=0
We get rid of parentheses
5x+x+12-90=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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