`\frac{2x}{-9} = \frac{10}{91}`

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`\frac{2x}{-9} = \frac{10}{91}`

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    `(2x)/(-9) = 10/91`

    `=> ( 2x ) . 91 = 10 . (-9 )`

    `=> ( 2x ) . 91 = -90`

    `=> 2x = -90 : 91`

    `=> 2x = (-90)/91`

    `=> x = (-90)/91 : 2`

    `=> x = (-45)/91`

    Vậy `x = (-45)/91`

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