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-3x-12=-6(x-3)
We move all terms to the left:
-3x-12-(-6(x-3))=0
We calculate terms in parentheses: -(-6(x-3)), so:We get rid of parentheses
-6(x-3)
We multiply parentheses
-6x+18
Back to the equation:
-(-6x+18)
-3x+6x-18-12=0
We add all the numbers together, and all the variables
3x-30=0
We move all terms containing x to the left, all other terms to the right
3x=30
x=30/3
x=10
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