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-31=3x+2
We move all terms to the left:
-31-(3x+2)=0
We get rid of parentheses
-3x-2-31=0
We add all the numbers together, and all the variables
-3x-33=0
We move all terms containing x to the left, all other terms to the right
-3x=33
x=33/-3
x=-11
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