21=12-3z

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Solution for 21=12-3z equation: 



21=12-3z

We move all terms to the left:

21-(12-3z)=0

We add all the numbers together, and all the variables

-(-3z+12)+21=0

We get rid of parentheses

3z-12+21=0

We add all the numbers together, and all the variables

3z+9=0

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

3z=-9

z=-9/3

z=-3

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