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75=15+5z
We move all terms to the left:
75-(15+5z)=0
We add all the numbers together, and all the variables
-(5z+15)+75=0
We get rid of parentheses
-5z-15+75=0
We add all the numbers together, and all the variables
-5z+60=0
We move all terms containing z to the left, all other terms to the right
-5z=-60
z=-60/-5
z=+12
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