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(5z-3)+(5z-3)+(4z)+(4z)=84
We move all terms to the left:
(5z-3)+(5z-3)+(4z)+(4z)-(84)=0
We add all the numbers together, and all the variables
8z+(5z-3)+(5z-3)-84=0
We get rid of parentheses
8z+5z+5z-3-3-84=0
We add all the numbers together, and all the variables
18z-90=0
We move all terms containing z to the left, all other terms to the right
18z=90
z=90/18
z=5
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