21=z-10

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Solution for 21=z-10 equation: 



21=z-10

We move all terms to the left:

21-(z-10)=0

We get rid of parentheses

-z+10+21=0

We add all the numbers together, and all the variables

-1z+31=0

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

-z=-31

z=-31/-1

z=+31

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