15=-3z+9z

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Solution for 15=-3z+9z equation: 



15=-3z+9z

We move all terms to the left:

15-(-3z+9z)=0

We add all the numbers together, and all the variables

-(+6z)+15=0

We get rid of parentheses

-6z+15=0

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

-6z=-15

z=-15/-6

z=2+1/2

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