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40-1280=0.25*40P
We move all terms to the left:
40-1280-(0.25*40P)=0
We add all the numbers together, and all the variables
-(+0.25*40P)+40-1280=0
We add all the numbers together, and all the variables
-(+0.25*40P)-1240=0
We get rid of parentheses
-0.25*40P-1240=0
We move all terms containing P to the left, all other terms to the right
-0.25*40P=1240
P=1240/1
P=1240
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