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9x-18=-9(x+4)
We move all terms to the left:
9x-18-(-9(x+4))=0
We calculate terms in parentheses: -(-9(x+4)), so:We get rid of parentheses
-9(x+4)
We multiply parentheses
-9x-36
Back to the equation:
-(-9x-36)
9x+9x+36-18=0
We add all the numbers together, and all the variables
18x+18=0
We move all terms containing x to the left, all other terms to the right
18x=-18
x=-18/18
x=-1
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