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20.5=25-Q
We move all terms to the left:
20.5-(25-Q)=0
We add all the numbers together, and all the variables
-(-1Q+25)+20.5=0
We get rid of parentheses
1Q-25+20.5=0
We add all the numbers together, and all the variables
Q-4.5=0
We move all terms containing Q to the left, all other terms to the right
Q=4.5
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