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500-40p=20p-100
We move all terms to the left:
500-40p-(20p-100)=0
We get rid of parentheses
-40p-20p+100+500=0
We add all the numbers together, and all the variables
-60p+600=0
We move all terms containing p to the left, all other terms to the right
-60p=-600
p=-600/-60
p=+10
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