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3-13x=4x-31
We move all terms to the left:
3-13x-(4x-31)=0
We get rid of parentheses
-13x-4x+31+3=0
We add all the numbers together, and all the variables
-17x+34=0
We move all terms containing x to the left, all other terms to the right
-17x=-34
x=-34/-17
x=+2
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