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(4z-10)=90
We move all terms to the left:
(4z-10)-(90)=0
We get rid of parentheses
4z-10-90=0
We add all the numbers together, and all the variables
4z-100=0
We move all terms containing z to the left, all other terms to the right
4z=100
z=100/4
z=25
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