21=-3z-3

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Solution for 21=-3z-3 equation: 



21=-3z-3

We move all terms to the left:

21-(-3z-3)=0

We get rid of parentheses

3z+3+21=0

We add all the numbers together, and all the variables

3z+24=0

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

3z=-24

z=-24/3

z=-8

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