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-4x+8(x+4)=12
We move all terms to the left:
-4x+8(x+4)-(12)=0
We multiply parentheses
-4x+8x+32-12=0
We add all the numbers together, and all the variables
4x+20=0
We move all terms containing x to the left, all other terms to the right
4x=-20
x=-20/4
x=-5
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