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`2/7 : x = 4/5`

`x = 2/7 : 4/5`

`x = 2/7 xx 5/4`

`x = 10/28`

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`x xx 2/3 = 3/2`

`x = 3/2 : 2/3`

`x = 3/2 xx 3/2`

`x = 9/4`

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`4 : x = 1/8`

`x = 4 : 1/8`

`x = 4 xx 8/1`

`x = 32`

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`x : 2/3 = 150`

`x = 150 xx 2/3`

`x = 100`

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`9/25 - 11/25 : x = 1/5`

`11/25 : x = 9/25 - 1/5`

`11/25 : x = 9/25 - 5/25`

`11/25 : x = 4/25`

`x = 11/25 : 4/25`

`x = 11/25 xx 25/4`

`x = 275/100`

`x = 11/4`

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`16/27 xx x + 2/9 = 10/27`

`16/27 xx x = 10/27 - 2/9`

`16/27 xx x = 10/27 - 6/27`

`16/27 xx x = 4/27`

`x = 4/27 : 16/27`

`x = 4/27 xx 27/16`

`x = 108/432`

`x = 1/4`