P(q)=90-3q

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Solution for P(q)=90-3q equation: 



(P)=90-3P

We move all terms to the left:

(P)-(90-3P)=0

We add all the numbers together, and all the variables

P-(-3P+90)=0

We get rid of parentheses

P+3P-90=0

We add all the numbers together, and all the variables

4P-90=0

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

4P=90

P=90/4

P=22+1/2

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