` \frac{x+3}{57} + \frac{x+2}{58} + \frac{x+1}{59} = 1/57 + 1/58 + 1/59 - 3 `
` <=> (\frac{x+3}{57} + \frac{x + 2}{58} + \frac{x+1}{59}) + 3 = 1/57 + 1/58 + 1/59 `
` <=> \frac{x+3}{57} + 1 + \frac{x+2}{58} + 1 + \frac{x+1}{59} + 1 = 1/57 + 1/58 + 1/59 `
` <=> \frac{x+60}{57} + \frac{x+60}{58} + \frac{x+60}{59} = 1/57 + 1/58 + 1/59 `
` <=> (x + 60)(1/57 + 1/58 + 1/59) = 1/57 + 1/58 + 1/59 `
` <=> x + 60 = (1/57 + 1/58 + 1/59) : (1/57 + 1/58 + 1/59) `
` <=> x + 60 = 1 `
` <=> x = -59 `
Vậy ` x = -59 `