Question

(7/15 - 4/15) - 2/15

Answer 1

(7/15 - 4/15 ) - 2/15 =
7 - 4  / 15 - 2/15 =
3/15 - 2/15 =
3-2 / 15 =
1/15

Answer 2

$( \frac{7}{15} - \frac{4}{15} )- \frac{2}{15} = \frac{3}{15} - \frac{2}{15} = \frac{1}{15} =0,066$