9=21-4z

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Solution for 9=21-4z equation: 



9=21-4z

We move all terms to the left:

9-(21-4z)=0

We add all the numbers together, and all the variables

-(-4z+21)+9=0

We get rid of parentheses

4z-21+9=0

We add all the numbers together, and all the variables

4z-12=0

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

4z=12

z=12/4

z=3

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