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=20-Q/2
We move all terms to the left:
-(20-Q/2)=0
We add all the numbers together, and all the variables
-(-Q/2+20)=0
We get rid of parentheses
Q/2-20=0
We multiply all the terms by the denominator
Q-20*2=0
We add all the numbers together, and all the variables
Q-40=0
We move all terms containing Q to the left, all other terms to the right
Q=40
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