13=9-4q

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Solution for 13=9-4q equation: 



13=9-4q

We move all terms to the left:

13-(9-4q)=0

We add all the numbers together, and all the variables

-(-4q+9)+13=0

We get rid of parentheses

4q-9+13=0

We add all the numbers together, and all the variables

4q+4=0

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

4q=-4

q=-4/4

q=-1

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