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5q+11=3q+21
We move all terms to the left:
5q+11-(3q+21)=0
We get rid of parentheses
5q-3q-21+11=0
We add all the numbers together, and all the variables
2q-10=0
We move all terms containing q to the left, all other terms to the right
2q=10
q=10/2
q=5
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