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-9=x+(-16)
We move all terms to the left:
-9-(x+(-16))=0
We calculate terms in parentheses: -(x+(-16)), so:We get rid of parentheses
x+(-16)
We add all the numbers together, and all the variables
x-16
Back to the equation:
-(x-16)
-x+16-9=0
We add all the numbers together, and all the variables
-1x+7=0
We move all terms containing x to the left, all other terms to the right
-x=-7
x=-7/-1
x=+7
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