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=-Q+15
We move all terms to the left:
-(-Q+15)=0
We add all the numbers together, and all the variables
-(-1Q+15)=0
We get rid of parentheses
1Q-15=0
We add all the numbers together, and all the variables
Q-15=0
We move all terms containing Q to the left, all other terms to the right
Q=15
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