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12=-2(x+4)
We move all terms to the left:
12-(-2(x+4))=0
We calculate terms in parentheses: -(-2(x+4)), so:We get rid of parentheses
-2(x+4)
We multiply parentheses
-2x-8
Back to the equation:
-(-2x-8)
2x+8+12=0
We add all the numbers together, and all the variables
2x+20=0
We move all terms containing x to the left, all other terms to the right
2x=-20
x=-20/2
x=-10
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