6-3z=-21

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Solution for 6-3z=-21 equation: 



6-3z=-21

We move all terms to the left:

6-3z-(-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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