7z+7=9z-9

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Solution for 7z+7=9z-9 equation: 



7z+7=9z-9

We move all terms to the left:

7z+7-(9z-9)=0

We get rid of parentheses

7z-9z+9+7=0

We add all the numbers together, and all the variables

-2z+16=0

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

-2z=-16

z=-16/-2

z=+8

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