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3x+8=4x+31
We move all terms to the left:
3x+8-(4x+31)=0
We get rid of parentheses
3x-4x-31+8=0
We add all the numbers together, and all the variables
-1x-23=0
We move all terms containing x to the left, all other terms to the right
-x=23
x=23/-1
x=-23
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