Đáp án:
`x=-2020`
Giải thích các bước giải:
`(x+1)/2019 + (x+2)/2018 + (x+3)/2017 + 3 =0`
`<=> [(x+1)/2019]+1+[ (x+2)/2018]+1+[ (x+3)/2017 ]+1=0`
`<=> (x+1+2019 )/2019 +(x+2+2018)/2018 + (x+3+2017)/2017 =0`
`<=> (x+2020)/2019 +(x+2020)/2018 + (x+2020)/2017 =0`
`<=> (x+2020)(1/2019 + 1/2018 + 1/2017)=0`
Vì` (1/2019 + 1/2018 + 1/2017)> 0`
`=> x+2020=0`
`<=>x=-2020`
Vậy `x=-2020`
