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(5x-12)+(3x+10)=90
We move all terms to the left:
(5x-12)+(3x+10)-(90)=0
We get rid of parentheses
5x+3x-12+10-90=0
We add all the numbers together, and all the variables
8x-92=0
We move all terms containing x to the left, all other terms to the right
8x=92
x=92/8
x=11+1/2
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