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`c)2/3+1/3:3x=1/5`
`=>1/3:3x=1/5-2/3`
`=>1/3:3x=3/15-10/15`
`=>1/3:3x=-7/15`
`=>3x=1/3:(-7/15)`
`=>3x=1/3 . (-15/7)`
`=>3x=-5/7`
`=>x=-5/7:3`
`=>x=-5/7 . 1/3`
`=>x=-5/21`
`2/3+1/3:3x=1/5`
`=> 1/3:3x=1/5-2/3`
`=> 1/3:3x=-7/15`
`=> 3x=1/3:(-7/15)`
`=> 3x=-5/7`
`=> x=-5/7:3`
`=> x=-5/21`
`c)2/3+1/3:3x=1/5`
`=>1/3:3x=1/5-2/3`
`=>1/3:3x=3/15-10/15`
`=>1/3:3x=-7/15`
`=>3x=1/3:(-7/15)`
`=>3x=1/3 . (-15/7)`
`=>3x=-5/7`
`=>x=-5/7:3`
`=>x=-5/7 . 1/3`
`=>x=-5/21`
`2/3+1/3:3x=1/5`
`=> 1/3:3x=1/5-2/3`
`=> 1/3:3x=-7/15`
`=> 3x=1/3:(-7/15)`
`=> 3x=-5/7`
`=> x=-5/7:3`
`=> x=-5/21`