-3=-9+2z

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Solution for -3=-9+2z equation: 



-3=-9+2z

We move all terms to the left:

-3-(-9+2z)=0

We add all the numbers together, and all the variables

-(2z-9)-3=0

We get rid of parentheses

-2z+9-3=0

We add all the numbers together, and all the variables

-2z+6=0

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

-2z=-6

z=-6/-2

z=+3

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