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21000-12p=15000+10p
We move all terms to the left:
21000-12p-(15000+10p)=0
We add all the numbers together, and all the variables
-12p-(10p+15000)+21000=0
We get rid of parentheses
-12p-10p-15000+21000=0
We add all the numbers together, and all the variables
-22p+6000=0
We move all terms containing p to the left, all other terms to the right
-22p=-6000
p=-6000/-22
p=272+8/11
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