Đáp án:
Giải thích các bước giải:
`x+2/11 + x+2/12 + x+2/13 = x+2/14 + x+2/15`
`→ x + 2/11 + x + 1/6 + x + 2/13 = x+2/14 + x+2/15`
`→ x + 431/858 + x + x = x + 2/14 + x + 2/15`
`→ 3x + 431/858 = x+ 1/7 + x + 2/15`
`→ 3x + 431/858 = 2x + 29/105`
`→ 3x + 431/858 - 431/858 = 2x + 29/105 - 431/858`
`→ 3x = 2x−6791/30030`
`→ 3x - 2x = 2x - 6791/30030 - 2x`
`→ x=−6791/30030`