21=-3z-7z

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Solution for 21=-3z-7z equation: 



21=-3z-7z

We move all terms to the left:

21-(-3z-7z)=0

We add all the numbers together, and all the variables

-(-10z)+21=0

We get rid of parentheses

10z+21=0

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

10z=-21

z=-21/10

z=-2+1/10

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