To subtract fractions, you need to have a common denominator. The denominator in this case is 36:
7/9 - 1/4 = (7/9)(4/4) - (1/4)(9/9) = 28/36 - 9/36
Subtracting the numerators:
28/36 - 9/36 = 19/36
7/9- negative1/4
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