-9=-7+z

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Solution for -9=-7+z equation: 



-9=-7+z

We move all terms to the left:

-9-(-7+z)=0

We add all the numbers together, and all the variables

-(z-7)-9=0

We get rid of parentheses

-z+7-9=0

We add all the numbers together, and all the variables

-1z-2=0

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

-z=2

z=2/-1

z=-2

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