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(4x-42)=102
We move all terms to the left:
(4x-42)-(102)=0
We get rid of parentheses
4x-42-102=0
We add all the numbers together, and all the variables
4x-144=0
We move all terms containing x to the left, all other terms to the right
4x=144
x=144/4
x=36
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