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`(x+1)/2021 +(x+2) /2022= (x+3)/2023+ (x+4)/2024`
`(x+1)/2021 -1+(x+2) /2022 -1= (x+3)/2023 -1+ (x+4)/2024 -1`
`(x-2020)/2021+(x-2020)/2022=(x-2020)/2023+(x-2020)/2024`
`(x-2020)(1/20212021+1/2022-1/2023-1/2024)=0`
`=> x=2020`
$\text{Vì}$
`1/20212021+1/2022-1/2023-1/2024>0`
