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7=-2(x+9)
We move all terms to the left:
7-(-2(x+9))=0
We calculate terms in parentheses: -(-2(x+9)), so:We get rid of parentheses
-2(x+9)
We multiply parentheses
-2x-18
Back to the equation:
-(-2x-18)
2x+18+7=0
We add all the numbers together, and all the variables
2x+25=0
We move all terms containing x to the left, all other terms to the right
2x=-25
x=-25/2
x=-12+1/2
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