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=10000-25Q
We move all terms to the left:
-(10000-25Q)=0
We add all the numbers together, and all the variables
-(-25Q+10000)=0
We get rid of parentheses
25Q-10000=0
We move all terms containing Q to the left, all other terms to the right
25Q=10000
Q=10000/25
Q=400
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