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`1)x*7/2=7/9`

`x=7/9:7/2`

`x=2/9`

Vậy `x=2/9`

`2)3/4:x=1/2`

`x=3/4:1/2`

`x=3/2`

Vậy `x=3/2`

`3)x-1/4=3/4*(-5)/7`

`x-1/4=(-15)/28`

`x=(-15)/28+1/4`

`x=(-2)/7`

Vậy `x=(-2)/7`

`4)x:17/8=(-2)/5*(-9)/16`

`x:17/8=9/40`

`x=9/40*17/8`

`x=153/320`

Vậy `x=153/320`

`5)4/(-9):x=(-5)/(-3)`

`(-4)/9:x=5/3`

`x=(-4)/9:5/3`

`x=(-4)/15`

Vậy `x=(-4)/15`

`6)x*2/3=(-1)/12*(-4)/5`

`x*2/3=1/12*4/5`

`x*2/3=1/15`

`x=1/15:2/3`

`x=1/10`

Vậy `x=1/10`