6z-9z=-20-1

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Solution for 6z-9z=-20-1 equation: 



6z-9z=-20-1

We move all terms to the left:

6z-9z-(-20-1)=0

We add all the numbers together, and all the variables

6z-9z-(-21)=0

We add all the numbers together, and all the variables

-3z+21=0

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

-3z=-21

z=-21/-3

z=+7

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