7q+3q+q-8q=15

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Solution for 7q+3q+q-8q=15 equation: 



7q+3q+q-8q=15

We move all terms to the left:

7q+3q+q-8q-(15)=0

We add all the numbers together, and all the variables

3q-15=0

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

3q=15

q=15/3

q=5

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