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=30+0.2Q
We move all terms to the left:
-(30+0.2Q)=0
We add all the numbers together, and all the variables
-(0.2Q+30)=0
We get rid of parentheses
-0.2Q-30=0
We move all terms containing Q to the left, all other terms to the right
-0.2Q=30
Q=30/-0.2
Q=-150
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