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(5z+8)-(4z+20)=90
We move all terms to the left:
(5z+8)-(4z+20)-(90)=0
We get rid of parentheses
5z-4z+8-20-90=0
We add all the numbers together, and all the variables
z-102=0
We move all terms containing z to the left, all other terms to the right
z=102
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