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=200-0.5Q
We move all terms to the left:
-(200-0.5Q)=0
We add all the numbers together, and all the variables
-(-0.5Q+200)=0
We get rid of parentheses
0.5Q-200=0
We move all terms containing Q to the left, all other terms to the right
0.5Q=200
Q=200/0.5
Q=400
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