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-4x-4(3x+25)=12
We move all terms to the left:
-4x-4(3x+25)-(12)=0
We multiply parentheses
-4x-12x-100-12=0
We add all the numbers together, and all the variables
-16x-112=0
We move all terms containing x to the left, all other terms to the right
-16x=112
x=112/-16
x=-7
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