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(x-4)+(2x+3)=90
We move all terms to the left:
(x-4)+(2x+3)-(90)=0
We get rid of parentheses
x+2x-4+3-90=0
We add all the numbers together, and all the variables
3x-91=0
We move all terms containing x to the left, all other terms to the right
3x=91
x=91/3
x=30+1/3
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