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15=x/2-(-10)
We move all terms to the left:
15-(x/2-(-10))=0
We multiply all the terms by the denominator
-(x+15*2-(-10))=0
We calculate terms in parentheses: -(x+15*2-(-10)), so:We get rid of parentheses
x+15*2-(-10)
We add all the numbers together, and all the variables
x+40
Back to the equation:
-(x+40)
-x-40=0
We add all the numbers together, and all the variables
-1x-40=0
We move all terms containing x to the left, all other terms to the right
-x=40
x=40/-1
x=-40
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