21=4z-7

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Solution for 21=4z-7 equation: 



21=4z-7

We move all terms to the left:

21-(4z-7)=0

We get rid of parentheses

-4z+7+21=0

We add all the numbers together, and all the variables

-4z+28=0

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

-4z=-28

z=-28/-4

z=+7

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