`-5/8 - x = -3/20 - (-1/6) `
`=> -5/8 - x = -3/20 - (-1/6) `
`=> -5/8 - x = 1/60`
`=> x = -5/8 - 1/60`
`=> x = -77/120`
`(2 4/5x - 50) : 2/3 =51`
`=> 14/5x - 50 = 51 . 2/3`
`=> 14/5x - 50 = 34`
`=> 14/5x = 84`
`=> x = 84 : 14/5`
`=> x = 30`
`(2,8x - 32) : 2/3 = -90`
`=> 2,8x - 32 = -90 . 2/3`
`=> 2,8x - 32 = -60`
`=> 2,8x = -28`
`=> x = -28 : 2,8`
`=> x = -10`
`-2/3 - 1/3 (2x - 5) = 3/2`
`=> 1/3 (2x - 5) = -2/3 - 3/2`
`=> 1/3 (2x - 5) = -13/6`
`=> 2x - 5 = -13/6 : 1/3`
`=> 2x - 5 = -13/6 : 1/3`
`=> 2x - 5 = -13/2`
`=> 2x = -13/2 + 5`
`=> 2x = -3/2`
`=> x = -3/2 : 2 `
`=> x = -3/4`
(Chúc bạn học tốt)
