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3x-88=7x+40
We move all terms to the left:
3x-88-(7x+40)=0
We get rid of parentheses
3x-7x-40-88=0
We add all the numbers together, and all the variables
-4x-128=0
We move all terms containing x to the left, all other terms to the right
-4x=128
x=128/-4
x=-32
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