`a)x . (-3/8) = 2/5`
`=>x= 2/5 : (-3/8)`
`=>x= 2/5 . (-8/3)`
`=>x= -16/15`
`b) 5/8 x + 2/5 = 1/5`
`=> 5/8 x= 1/5-2/5`
`=> 5/8 x= -1/5`
`=>x= -1/5 : 5/8`
`=>x= -1/5 . 8/5`
`=>x=-8/25`
`c) x: 8/11= 11/3`
`=>x= 11/3 . 8/11`
`=>x= 8/3`
`d) -3/5 . x =1/4 +0,75`
`=> -3/5 . x =1`
`=> x =1 : (-3/5)`
`=>x= 1 . (-5/3)`
`=>x=-5/3`
