21=z+5

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Solution for 21=z+5 equation: 



21=z+5

We move all terms to the left:

21-(z+5)=0

We get rid of parentheses

-z-5+21=0

We add all the numbers together, and all the variables

-1z+16=0

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

-z=-16

z=-16/-1

z=+16

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