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31=3x-11
We move all terms to the left:
31-(3x-11)=0
We get rid of parentheses
-3x+11+31=0
We add all the numbers together, and all the variables
-3x+42=0
We move all terms containing x to the left, all other terms to the right
-3x=-42
x=-42/-3
x=+14
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