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-12=x(-3)
We move all terms to the left:
-12-(x(-3))=0
We calculate terms in parentheses: -(x(-3)), so:We get rid of parentheses
x(-3)
We multiply parentheses
-3x
Back to the equation:
-(-3x)
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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