7. 19 31 28+59

$$ \frac{19}{28} + \frac{31}{59} = \frac{19 \times 59 + 31 \times 28}{28 \times 59} = \frac{1121 + 868}{1652} = \frac{1989}{1652} = 1 \frac{337}{1652} $$