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x+31=7x-11
We move all terms to the left:
x+31-(7x-11)=0
We get rid of parentheses
x-7x+11+31=0
We add all the numbers together, and all the variables
-6x+42=0
We move all terms containing x to the left, all other terms to the right
-6x=-42
x=-42/-6
x=+7
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