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First you make it as similar denominators by finding its LCD, then when you already found its similar denominators you can now subtract its numerator after that you can subtract the whole number.
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In subtracting unlike mixed numbers (mixed numbers with different denominators), you must find their equivalent fractions with a common denominator first before subtracting by finding its LCD (Least Common Denominators). 
To see how it is done, see attached file for an example.

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