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3x-42=4x-88
We move all terms to the left:
3x-42-(4x-88)=0
We get rid of parentheses
3x-4x+88-42=0
We add all the numbers together, and all the variables
-1x+46=0
We move all terms containing x to the left, all other terms to the right
-x=-46
x=-46/-1
x=+46
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