Đáp án:
`2,7 × x + 8,2 × x + x = 60`
`2,7 × x + 8,2 × x + x × 1 = 60`
`(2,7 + 8,2 + 1) × x = 60`
`11,9 × x = 60`
`x = 60 : 11,9`
`x= 600/119`
`(x-1/2) ×5/3 =7/4 -1/2`
`(x-1/2) ×5/3 =5/4`
`x - 1/2 = 5/4 : 5/3`
`x - 1/2 = 3/4`
`x = 3/4 + 1/2`
`x = 5/4`