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(3x+57)+(4x-2)=90
We move all terms to the left:
(3x+57)+(4x-2)-(90)=0
We get rid of parentheses
3x+4x+57-2-90=0
We add all the numbers together, and all the variables
7x-35=0
We move all terms containing x to the left, all other terms to the right
7x=35
x=35/7
x=5
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