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= (a - 1/3a + 1 1/3a) + (b+1/5b-1 1/4b) + (c-1/4c+4/5c)
=(1-1/3+ 1 1/3) a + (1+1/5 - 1 1/4) b + (1-1/4+4/5) c
= 6/3a - 1/20b + 31/20c
= 2a - 1/20b + 1 11/20c
Maaf kalau salah.