MATH!!!
posted by David .
I tried to multiply the equation by a then b then c... I don't know please help by showing the steps I am very lost
Determine a+b+c
25/84=1/a+1/an+1/abc

Sorry it was supposed to be
Determine a+b+c
25/84=1/a+1/ab+1/abc 
It's hard to explain.
Because of that in google type:
CRUX MATHEMATICORUM Contest Corner Problem CC210
When you see list of results click on:
There are exactly two positive integer triples (a , b , c) such that , 25/84 ...
and read answer.
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Please help and show steps i am very confused... Determine a+b+c 25/84=1/a+1/ab+1/abc