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(P)=20P-75
We move all terms to the left:
(P)-(20P-75)=0
We get rid of parentheses
P-20P+75=0
We add all the numbers together, and all the variables
-19P+75=0
We move all terms containing P to the left, all other terms to the right
-19P=-75
P=-75/-19
P=3+18/19
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