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8z-7=3z+80
We move all terms to the left:
8z-7-(3z+80)=0
We get rid of parentheses
8z-3z-80-7=0
We add all the numbers together, and all the variables
5z-87=0
We move all terms containing z to the left, all other terms to the right
5z=87
z=87/5
z=17+2/5
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