z-84=4z-21

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Solution for z-84=4z-21 equation: 



z-84=4z-21

We move all terms to the left:

z-84-(4z-21)=0

We get rid of parentheses

z-4z+21-84=0

We add all the numbers together, and all the variables

-3z-63=0

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

-3z=63

z=63/-3

z=-21

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