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8-13=z/(-7)
We move all terms to the left:
8-13-(z/(-7))=0
We add all the numbers together, and all the variables
-(z/(-7))-5=0
We multiply all the terms by the denominator
-(z-5*(-7))=0
We calculate terms in parentheses: -(z-5*(-7)), so:We get rid of parentheses
z-5*(-7)
We add all the numbers together, and all the variables
z+35
Back to the equation:
-(z+35)
-z-35=0
We add all the numbers together, and all the variables
-1z-35=0
We move all terms containing z to the left, all other terms to the right
-z=35
z=35/-1
z=-35
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