21=6z+9

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Solution for 21=6z+9 equation: 



21=6z+9

We move all terms to the left:

21-(6z+9)=0

We get rid of parentheses

-6z-9+21=0

We add all the numbers together, and all the variables

-6z+12=0

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

-6z=-12

z=-12/-6

z=+2

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