-21=-3z-3=6

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Solution for -21=-3z-3=6 equation: 



-21=-3z-3=6

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-18=0

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

3z=18

z=18/3

z=6

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