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40=p*0.04*2
We move all terms to the left:
40-(p*0.04*2)=0
We add all the numbers together, and all the variables
-(+p*0.04*2)+40=0
We get rid of parentheses
-p*0.04*2+40=0
Wy multiply elements
-0.08p+40=0
We move all terms containing p to the left, all other terms to the right
-0.08p=-40
p=-40/-0.08
p=+500
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