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=100-1.25Q
We move all terms to the left:
-(100-1.25Q)=0
We add all the numbers together, and all the variables
-(-1.25Q+100)=0
We get rid of parentheses
1.25Q-100=0
We move all terms containing Q to the left, all other terms to the right
1.25Q=100
Q=100/1.25
Q=80
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