90=3z-30

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Solution for 90=3z-30 equation: 



90=3z-30

We move all terms to the left:

90-(3z-30)=0

We get rid of parentheses

-3z+30+90=0

We add all the numbers together, and all the variables

-3z+120=0

We move all terms containing z to the left, all other terms to the right

-3z=-120

z=-120/-3

z=+40

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