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(2x-12)+(2x+10)=90
We move all terms to the left:
(2x-12)+(2x+10)-(90)=0
We get rid of parentheses
2x+2x-12+10-90=0
We add all the numbers together, and all the variables
4x-92=0
We move all terms containing x to the left, all other terms to the right
4x=92
x=92/4
x=23
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