sum_fractions([[18, 13], [4, 5]]) ➞ 2

sum_fractions([[36, 4], [22, 60]]) ➞ 9

sum_fractions([[11, 2], [3, 4], [5, 4], [21, 11], [12, 6]]) ➞ 11

self.assertEqual(sum_fractions([[18, 13], [4, 5]]), 2)
self.assertEqual(sum_fractions([[36, 4], [22, 60]]), 9)
self.assertEqual(sum_fractions([[11, 2], [3, 4], [5, 4], [21, 11], [12, 6]]), 11)
self.assertEqual(sum_fractions([[-11, 12], [18, 13], [4, 5]]), 1)
self.assertEqual(sum_fractions([[41, 14], [10, 91]]), 3)

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