Question

[(-15) +………] + 18 = (-15) + [(12 ) + 18]​

Answer 1

Answer:

[(-15) + (12)] + 18 = (-15) + [(12) + 18]

Ans. 12

Hope it helps.

Answer 2

Answer will be + 12 ( positive 12 )

Explanation :

-15 + x +18 = -15 + ( 12+18)

3 + x = -15 + 30

x = 15 -3

x = 12