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(3z+2)+(8z)=90
We move all terms to the left:
(3z+2)+(8z)-(90)=0
We add all the numbers together, and all the variables
8z+(3z+2)-90=0
We get rid of parentheses
8z+3z+2-90=0
We add all the numbers together, and all the variables
11z-88=0
We move all terms containing z to the left, all other terms to the right
11z=88
z=88/11
z=8
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