21=8z-3

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Solution for 21=8z-3 equation: 



21=8z-3

We move all terms to the left:

21-(8z-3)=0

We get rid of parentheses

-8z+3+21=0

We add all the numbers together, and all the variables

-8z+24=0

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

-8z=-24

z=-24/-8

z=+3

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