3z+21=21-3z

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



3z+21=21-3z

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3z+3z-21+21=0

We add all the numbers together, and all the variables

6z=0

z=0/6

z=0

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