15=9+3q

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Solution for 15=9+3q equation: 



15=9+3q

We move all terms to the left:

15-(9+3q)=0

We add all the numbers together, and all the variables

-(3q+9)+15=0

We get rid of parentheses

-3q-9+15=0

We add all the numbers together, and all the variables

-3q+6=0

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

-3q=-6

q=-6/-3

q=+2

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