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12=-4(-6x-9)
We move all terms to the left:
12-(-4(-6x-9))=0
We calculate terms in parentheses: -(-4(-6x-9)), so:We get rid of parentheses
-4(-6x-9)
We multiply parentheses
24x+36
Back to the equation:
-(24x+36)
-24x-36+12=0
We add all the numbers together, and all the variables
-24x-24=0
We move all terms containing x to the left, all other terms to the right
-24x=24
x=24/-24
x=-1
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