-7z-1=9-9z

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Solution for -7z-1=9-9z equation: 



-7z-1=9-9z

We move all terms to the left:

-7z-1-(9-9z)=0

We add all the numbers together, and all the variables

-7z-(-9z+9)-1=0

We get rid of parentheses

-7z+9z-9-1=0

We add all the numbers together, and all the variables

2z-10=0

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

2z=10

z=10/2

z=5

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