a) x+3/7=8/5 b, X x 4/15 = 6/7
= x = 8/5 - 3/7 = X = 6/7 : 4/15
= x = 41/35 = X =45/14
c, x : 4/9 = 7/4 d, x - 7/15 = 6/5
= x = 7/4 x 4/9 = x = 6/5 + 7 /15
= x = 7/9 = x = 5/3
e)3/8+x=7/4:2 g, 15/19 :x = 8/5 - 4/15
= 3/8+ x = 7/8 = 15/19 : x = 4/3
= x = 7/8 - 3/8 = x = 15/19 : 4/ 3
= x= 1/2 = x = 45/76
h)15/4-x=5/12+4/3
= 15/4 - x = 7/4
= x = 15/4 - 7/4
= x = 2
`x+3/7=8/5`
`x=8/5-3/7`
`x=41/35`
__________________
`x xx 4/15 = 6/7`
`x=6/7 : 4/15`
`x=6/7 xx 15/4`
`x=45/14`
____________________
`x: 4/9 = 7/4`
`x=7/4 xx 4/9`
`x=7/9`
____________________
`x-7/15=6/5`
`x=6/5+7/15`
`x=18/15+7/15`
`x=25/15`
`x=5/3`
__________________________
`3/8 + x = 7/4 : 2`
`3/8+x=7/4xx1/2`
`3/8+x=7/8`
`x=7/8-3/8`
`x=4/8`
`x=1/2`
________________________
`15/19 :x=8/5-4/15`
`15/19 :x=4/3`
`x=15/19:4/3`
`x=15/19xxx 3/4`
`x=45/76`
________________________
`15/4 - x = 5/12 + 4/3`
`15/4 - x =7/4`
`x=15/4-7/4`
`x=-8/4`
`x=-2`