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3q-9=q+13
We move all terms to the left:
3q-9-(q+13)=0
We get rid of parentheses
3q-q-13-9=0
We add all the numbers together, and all the variables
2q-22=0
We move all terms containing q to the left, all other terms to the right
2q=22
q=22/2
q=11
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