`a, 1/7 -x=0,5`
`=>x= 1/7 - 1/2`
`=> x= 2/14 - 7/14`
`=> x= -5/14`
__
`b,1/2 +2/3 x =4/5`
`=> 2/3x = 4/5 -1/2`
`=> 2/3 x= 8/10 - 5/10`
`=> 2/3x = 3/10`
`=> x= 3/10 : 2/3`
`=> x= 3/10 xx 3/2`
`=> x= 9/20`
__
`d,x/5 = 5/6 + (-19)/30`
`=> x/5 = 25/30 + (-19)/30`
`=>x/5= 6/30`
`=> x/5= 1/5`
`=>x=1`
__
`f, 3/5 x +1/5=1/6`
`=> 3/5 x =1/6 -1/5`
`=>3/5 x= 5/30 - 6/30`
`=> 3/5 x=-1/30`
`=> x= -1/30 : 3/5`
`=> x= -1/30 xx 5/3`
`=> x= -5/90= -1/18`
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