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