-2z=-z-9

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Solution for -2z=-z-9 equation: 



-2z=-z-9

We move all terms to the left:

-2z-(-z-9)=0

We add all the numbers together, and all the variables

-2z-(-1z-9)=0

We get rid of parentheses

-2z+1z+9=0

We add all the numbers together, and all the variables

-1z+9=0

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

-z=-9

z=-9/-1

z=+9

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