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3x+135=4x+31
We move all terms to the left:
3x+135-(4x+31)=0
We get rid of parentheses
3x-4x-31+135=0
We add all the numbers together, and all the variables
-1x+104=0
We move all terms containing x to the left, all other terms to the right
-x=-104
x=-104/-1
x=+104
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