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90=5z+15
We move all terms to the left:
90-(5z+15)=0
We get rid of parentheses
-5z-15+90=0
We add all the numbers together, and all the variables
-5z+75=0
We move all terms containing z to the left, all other terms to the right
-5z=-75
z=-75/-5
z=+15
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