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39=4p+2.50p
We move all terms to the left:
39-(4p+2.50p)=0
We add all the numbers together, and all the variables
-(+6.5p)+39=0
We get rid of parentheses
-6.5p+39=0
We move all terms containing p to the left, all other terms to the right
-6.5p=-39
p=-39/-6.5
p=+6
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