-90=z-20

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Solution for -90=z-20 equation: 



-90=z-20

We move all terms to the left:

-90-(z-20)=0

We get rid of parentheses

-z+20-90=0

We add all the numbers together, and all the variables

-1z-70=0

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

-z=70

z=70/-1

z=-70

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