Answer:
Step-by-step explanation:
24 + _________ = 13
(Taking '________' = 'x', then)
=> 24 + x = 13
=> x = 13 - 24
=> x = -11
=> __________ = -11 (Ans)
-11
24 + x = 13
Subtract 24 from each side
24+x-24 = 13-24
x = -11
