Question

what should be added to (2/3 +3/5) to get -12/15 in steps

Answer 1

Let the unknown quantity be x
(2/3+3/5)+x=-12/15
Lcm of 3 and 5 is 15,so
10+9/15+x=-12/15
19/15+x=-12/15
X=-12/15-19/15
X=-31/15
For the verification
19/15-31/15
-12/15