3z+21=6z-6

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Solution for 3z+21=6z-6 equation: 



3z+21=6z-6

We move all terms to the left:

3z+21-(6z-6)=0

We get rid of parentheses

3z-6z+6+21=0

We add all the numbers together, and all the variables

-3z+27=0

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

-3z=-27

z=-27/-3

z=+9

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