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x+13=4x+31
We move all terms to the left:
x+13-(4x+31)=0
We get rid of parentheses
x-4x-31+13=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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