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-15=z/(-8)
We move all terms to the left:
-15-(z/(-8))=0
We multiply all the terms by the denominator
-(z-15*(-8))=0
We calculate terms in parentheses: -(z-15*(-8)), so:We get rid of parentheses
z-15*(-8)
We add all the numbers together, and all the variables
z+120
Back to the equation:
-(z+120)
-z-120=0
We add all the numbers together, and all the variables
-1z-120=0
We move all terms containing z to the left, all other terms to the right
-z=120
z=120/-1
z=-120
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