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31=4x-13
We move all terms to the left:
31-(4x-13)=0
We get rid of parentheses
-4x+13+31=0
We add all the numbers together, and all the variables
-4x+44=0
We move all terms containing x to the left, all other terms to the right
-4x=-44
x=-44/-4
x=+11
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