15=9+3z

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Solution for 15=9+3z equation: 



15=9+3z

We move all terms to the left:

15-(9+3z)=0

We add all the numbers together, and all the variables

-(3z+9)+15=0

We get rid of parentheses

-3z-9+15=0

We add all the numbers together, and all the variables

-3z+6=0

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

-3z=-6

z=-6/-3

z=+2

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