Question

[(13-7)-(3-15)-(15-3)]\1=

Answer 1

$\frac{((13 - 7) - (3 - 15) - (15 - 3))}{1} \\ = ((13 - 7) - (3 - 15) - (15 - 3)) \\ = ((6)- ( - 12) - (12)) \\ = (6 + 12 - 12) \\ = 6$