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(4x-7)+(7x-61)=90
We move all terms to the left:
(4x-7)+(7x-61)-(90)=0
We get rid of parentheses
4x+7x-7-61-90=0
We add all the numbers together, and all the variables
11x-158=0
We move all terms containing x to the left, all other terms to the right
11x=158
x=158/11
x=14+4/11
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