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12=-3(x-4)
We move all terms to the left:
12-(-3(x-4))=0
We calculate terms in parentheses: -(-3(x-4)), so:We get rid of parentheses
-3(x-4)
We multiply parentheses
-3x+12
Back to the equation:
-(-3x+12)
3x-12+12=0
We add all the numbers together, and all the variables
3x=0
x=0/3
x=0
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