Q=400-2p

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Solution for Q=400-2p equation: 



=400-2Q

We move all terms to the left:

-(400-2Q)=0

We add all the numbers together, and all the variables

-(-2Q+400)=0

We get rid of parentheses

2Q-400=0

We move all terms containing Q to the left, all other terms to the right

2Q=400

Q=400/2

Q=200

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