P(7.r)=840

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Solution for P(7.r)=840 equation: 



(7.P)=840

We move all terms to the left:

(7.P)-(840)=0

We add all the numbers together, and all the variables

(+7.P)-840=0

We get rid of parentheses

7.P-840=0

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

7.P=840

P=840/7.

P=120

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