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=20-3Q
We move all terms to the left:
-(20-3Q)=0
We add all the numbers together, and all the variables
-(-3Q+20)=0
We get rid of parentheses
3Q-20=0
We move all terms containing Q to the left, all other terms to the right
3Q=20
Q=20/3
Q=6+2/3
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