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(4x+3)+(7x-1)=90
We move all terms to the left:
(4x+3)+(7x-1)-(90)=0
We get rid of parentheses
4x+7x+3-1-90=0
We add all the numbers together, and all the variables
11x-88=0
We move all terms containing x to the left, all other terms to the right
11x=88
x=88/11
x=8
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