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144=-12(x+)
We move all terms to the left:
144-(-12(x+))=0
We add all the numbers together, and all the variables
-(-12(+x))+144=0
We calculate terms in parentheses: -(-12(+x)), so:We get rid of parentheses
-12(+x)
We multiply parentheses
-12x
Back to the equation:
-(-12x)
12x+144=0
We move all terms containing x to the left, all other terms to the right
12x=-144
x=-144/12
x=-12
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