Yes.
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5/7 ÷ 7/9 = 5/7 x 9/7 = (5 x 9)/(7 x 7) = 45/49
7/9 is greater.
-19/9. When you have a fraction divided by a fraction, you multiply the first fraction by the second fraction flipped over (switch the numerator and denominator). The sevens cancel out, and you are left with -19/9.
7 over 9... I would think it would be 0 and 7/9. If the top number is more than the denominator, it's hard to get a mixed fraction.
5/7 + 7/9 = 45/63 + 49/63 = 94/63 or 1 31/63