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(12x-5)+(6x+5)=90
We move all terms to the left:
(12x-5)+(6x+5)-(90)=0
We get rid of parentheses
12x+6x-5+5-90=0
We add all the numbers together, and all the variables
18x-90=0
We move all terms containing x to the left, all other terms to the right
18x=90
x=90/18
x=5
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