Expressed as a proper fraction in its simplest form, 4/7 - 4/9 = 8/63 or eight sixty-thirds.
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7/9 minus 3/4 is 1/36
The answer is -3 over 9
7/15 − 4/9 = 3/135 which reduces to 1/45
Expressed as a proper fraction in its simplest form, 1/7 - 4/9 = -19/63 (that is, minus nineteen sixty-thirds).
Converting all to ninths, that is 7 over 9 minus 3 over 9 which gives 4 over 9 as the answer.