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3q=9q-30
We move all terms to the left:
3q-(9q-30)=0
We get rid of parentheses
3q-9q+30=0
We add all the numbers together, and all the variables
-6q+30=0
We move all terms containing q to the left, all other terms to the right
-6q=-30
q=-30/-6
q=+5
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