`\frac{x-2}{13}+\frac{x-3}{12}+\frac{x-4}{11}+\frac{x-5}{10}+\frac{x-30}{5}=1`
`=> 660(x-2)+715(x-3)+780(x-4)+858(x-5)+1716(x-30)=8580`
`<=> 660-1320+715x-2145+780x-3120+858x-4290+1716x-51480=8580`
`<=> 4729x-62355=8580`
`<=> 4729x=8580+62355`
`<=> 4729x=70935`
`<=> x=70935/4729`
`<=> x=15`
Vậy `x=15`