-3=21+3z

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Solution for -3=21+3z equation: 



-3=21+3z

We move all terms to the left:

-3-(21+3z)=0

We add all the numbers together, and all the variables

-(3z+21)-3=0

We get rid of parentheses

-3z-21-3=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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