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4500=9000-100p
We move all terms to the left:
4500-(9000-100p)=0
We add all the numbers together, and all the variables
-(-100p+9000)+4500=0
We get rid of parentheses
100p-9000+4500=0
We add all the numbers together, and all the variables
100p-4500=0
We move all terms containing p to the left, all other terms to the right
100p=4500
p=4500/100
p=45
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