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-2(3-4x)-3(3x-7)=31
We move all terms to the left:
-2(3-4x)-3(3x-7)-(31)=0
We add all the numbers together, and all the variables
-2(-4x+3)-3(3x-7)-31=0
We multiply parentheses
8x-9x-6+21-31=0
We add all the numbers together, and all the variables
-1x-16=0
We move all terms containing x to the left, all other terms to the right
-x=16
x=16/-1
x=-16
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