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18=-(x-4)
We move all terms to the left:
18-(-(x-4))=0
We calculate terms in parentheses: -(-(x-4)), so:We get rid of parentheses
-(x-4)
We get rid of parentheses
-x+4
We add all the numbers together, and all the variables
-1x+4
Back to the equation:
-(-1x+4)
1x-4+18=0
We add all the numbers together, and all the variables
x+14=0
We move all terms containing x to the left, all other terms to the right
x=-14
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