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x-4(x+12)=-12
We move all terms to the left:
x-4(x+12)-(-12)=0
We add all the numbers together, and all the variables
x-4(x+12)+12=0
We multiply parentheses
x-4x-48+12=0
We add all the numbers together, and all the variables
-3x-36=0
We move all terms containing x to the left, all other terms to the right
-3x=36
x=36/-3
x=-12
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