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700=15p+400
We move all terms to the left:
700-(15p+400)=0
We get rid of parentheses
-15p-400+700=0
We add all the numbers together, and all the variables
-15p+300=0
We move all terms containing p to the left, all other terms to the right
-15p=-300
p=-300/-15
p=+20
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