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10q=9+9q
We move all terms to the left:
10q-(9+9q)=0
We add all the numbers together, and all the variables
10q-(9q+9)=0
We get rid of parentheses
10q-9q-9=0
We add all the numbers together, and all the variables
q-9=0
We move all terms containing q to the left, all other terms to the right
q=9
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