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72=0.04p
We move all terms to the left:
72-(0.04p)=0
We add all the numbers together, and all the variables
-(+0.04p)+72=0
We get rid of parentheses
-0.04p+72=0
We move all terms containing p to the left, all other terms to the right
-0.04p=-72
p=-72/-0.04
p=+1800
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