8z+6=9z-15

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Solution for 8z+6=9z-15 equation: 



8z+6=9z-15

We move all terms to the left:

8z+6-(9z-15)=0

We get rid of parentheses

8z-9z+15+6=0

We add all the numbers together, and all the variables

-1z+21=0

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

-z=-21

z=-21/-1

z=+21

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