Question

add 2/5  5/-9 and -6/15

Answer 1

2/5 + 5/-9 + -6/7

LCM of (3,9,15)=45
$\frac{32 + ( - 25) + ( - 6)}{45} \\ \frac{32 - 25 - 6}{45} = \frac{1}{45} = 45$
I hope this helps you