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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