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(P)=0.2P-100=500
We move all terms to the left:
(P)-(0.2P-100)=0
We get rid of parentheses
P-0.2P+100=0
We add all the numbers together, and all the variables
0.8P+100=0
We move all terms containing P to the left, all other terms to the right
0.8P=-100
P=-100/0.8
P=-125
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