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(P.3)=504
We move all terms to the left:
(P.3)-(504)=0
We add all the numbers together, and all the variables
(+P.3)-504=0
We get rid of parentheses
P.3-504=0
We move all terms containing P to the left, all other terms to the right
P.3=504
P=504/1
P=504
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