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-3(x-12)=-15
We move all terms to the left:
-3(x-12)-(-15)=0
We add all the numbers together, and all the variables
-3(x-12)+15=0
We multiply parentheses
-3x+36+15=0
We add all the numbers together, and all the variables
-3x+51=0
We move all terms containing x to the left, all other terms to the right
-3x=-51
x=-51/-3
x=+17
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