21=7z-7

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Solution for 21=7z-7 equation: 



21=7z-7

We move all terms to the left:

21-(7z-7)=0

We get rid of parentheses

-7z+7+21=0

We add all the numbers together, and all the variables

-7z+28=0

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

-7z=-28

z=-28/-7

z=+4

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