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(4x-100)=40
We move all terms to the left:
(4x-100)-(40)=0
We get rid of parentheses
4x-100-40=0
We add all the numbers together, and all the variables
4x-140=0
We move all terms containing x to the left, all other terms to the right
4x=140
x=140/4
x=35
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