`a)`
`2/9 - 7/8 xx x = 1/3 `
`=> 7/8 xx x = 2/9 - 1/3`
`=> 7/8 xx x =2/9 - 3/9`
`=> 7/8 xx x =-1/9`
`=>x=-1/9 : 7/8`
`=>x=-1/9 xx 8/7`
`=>x=-8/63`
`b)`
`(14 ,17 - x ) xx 2/9 = 1/3 `
`=> 14 ,17 - x = 1/3 : 2/9`
`=> 14 ,17 - x =1/3 xx 9/2`
`=> 14 ,17 - x =3/2`
`=>x= 14,17 - 3/2`
`=>x=12,67`
`c)`
`x xx 3 1/3 = 3 1/3 : 4 1/4 `
`=>x xx10/3 = 10/3 : 17/4`
`=>x xx10/3 = 10/3 xx 4/17`
`=>x xx10/3 = 40/51`
`=>x=40/51 : 10/3`
`=>x=40/51 xx 3/10`
`=>x=4/17`
\(a,-\dfrac{7}{8}x=\dfrac{2}{9}-\dfrac{1}{3}\\ -\dfrac{7}{8}x=\dfrac{2-3}{9}\\ -\dfrac{7}{8}x=-\dfrac{1}{9}\\ x=-\dfrac{1}{9}:\left(-\dfrac{7}{8}\right)\\ x=\dfrac{8}{63}\\ b,\left(14,17-x\right)=\dfrac{1}{3}:\dfrac{2}{9}\\ \left(14,17-x\right)=\dfrac{3}{2}\\ x=14,17-\dfrac{3}{2}\\ x=\dfrac{1267}{100}\\ c,x.\dfrac{10}{3}=\dfrac{10}{3}:\dfrac{17}{4}\\ x.\dfrac{10}{3}=\dfrac{40}{51}\\ x=\dfrac{40}{51}:\dfrac{10}{3}\\ x=\dfrac{4}{17}\)