Q=90-20p

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Solution for Q=90-20p equation: 



=90-20Q

We move all terms to the left:

-(90-20Q)=0

We add all the numbers together, and all the variables

-(-20Q+90)=0

We get rid of parentheses

20Q-90=0

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

20Q=90

Q=90/20

Q=4+1/2

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