P=120-3q

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Solution for P=120-3q equation: 



=120-3P

We move all terms to the left:

-(120-3P)=0

We add all the numbers together, and all the variables

-(-3P+120)=0

We get rid of parentheses

3P-120=0

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

3P=120

P=120/3

P=40

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