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7/19-1/12
=84/228-19/228
=65/228
7/19-(7/19-4/21)
=7/19-7/19+4/21
=4/21
7/19-4/21
=147/399-76/399
=71/399
=84/228-19/228
=65/228
7/19-(7/19-4/21)
=7/19-7/19+4/21
=4/21
7/19-4/21
=147/399-76/399
=71/399
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