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90=3z+4+5z-10
We move all terms to the left:
90-(3z+4+5z-10)=0
We add all the numbers together, and all the variables
-(8z-6)+90=0
We get rid of parentheses
-8z+6+90=0
We add all the numbers together, and all the variables
-8z+96=0
We move all terms containing z to the left, all other terms to the right
-8z=-96
z=-96/-8
z=+12
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