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-3(x-12)=15+4+1+1
We move all terms to the left:
-3(x-12)-(15+4+1+1)=0
We add all the numbers together, and all the variables
-3(x-12)-21=0
We multiply parentheses
-3x+36-21=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5
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