`4/5 + 7/6 : x = 1/6`
`7/6 : x = 1/6 - 4/5`
`7/6 : x= (-19)/30`
`x = 7/6 : (-19)/30`
`x =7/6 xx (-30)/19`
`x= (-35)/19`
7/6:x=4/5-1/6
7/6:x=24/30-5/30
7/6:x=19/30
X=7/6:19/30
X=7/6X30/19
X=35/19
`4/5 + 7/6 : x =1/6`
`=> 7/6 : x = 1/6 - 4/5 = 5/30 - 24/30 = -19/30`
`=> x = 7/6 : (-19)/30= -35/19`