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-12(-3-x)=144
We move all terms to the left:
-12(-3-x)-(144)=0
We add all the numbers together, and all the variables
-12(-1x-3)-144=0
We multiply parentheses
12x+36-144=0
We add all the numbers together, and all the variables
12x-108=0
We move all terms containing x to the left, all other terms to the right
12x=108
x=108/12
x=9
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