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1000=9000-100p
We move all terms to the left:
1000-(9000-100p)=0
We add all the numbers together, and all the variables
-(-100p+9000)+1000=0
We get rid of parentheses
100p-9000+1000=0
We add all the numbers together, and all the variables
100p-8000=0
We move all terms containing p to the left, all other terms to the right
100p=8000
p=8000/100
p=80
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