15=6+3z

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Solution for 15=6+3z equation: 



15=6+3z

We move all terms to the left:

15-(6+3z)=0

We add all the numbers together, and all the variables

-(3z+6)+15=0

We get rid of parentheses

-3z-6+15=0

We add all the numbers together, and all the variables

-3z+9=0

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

-3z=-9

z=-9/-3

z=+3

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