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57=10p+9p
We move all terms to the left:
57-(10p+9p)=0
We add all the numbers together, and all the variables
-(+19p)+57=0
We get rid of parentheses
-19p+57=0
We move all terms containing p to the left, all other terms to the right
-19p=-57
p=-57/-19
p=+3
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