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-3x+2(2x-11)=-31
We move all terms to the left:
-3x+2(2x-11)-(-31)=0
We add all the numbers together, and all the variables
-3x+2(2x-11)+31=0
We multiply parentheses
-3x+4x-22+31=0
We add all the numbers together, and all the variables
x+9=0
We move all terms containing x to the left, all other terms to the right
x=-9
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