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-2(3x+1)-3(-3x-4)=31
We move all terms to the left:
-2(3x+1)-3(-3x-4)-(31)=0
We multiply parentheses
-6x+9x-2+12-31=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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