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` 123 : x + 45 : x = 24`
` 123 xx 1/x + 45 xx 1/x = 24`
`1/x xx ( 123 + 45 ) = 24`
`1/x xx 168 = 24`
`1/x = 24 : 168`
`1/x = 1/7`
`=> x = 7`
Vậy ` x =7`
`x : 12 + x : 4 = 32`
`x xx 1/12 + x xx 1/3 = 32`
`x xx ( 1/12 + 1/3 ) = 32`
`x xx 1/3 = 32`
`x = 32 : 1/3`
`x = 32 xx 3`
`x = 96`
Vậy ` x = 96`
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