2/5 - 7 * (-3)

Answer 1

2/5 - 7 * (-3) = 2/5 - (-21)
= 2/5 + 21
= 2/5 + 21/1 (converting 21 to a fraction)
= (2 * 1 + 21 * 5) / (5 * 1)
= (2 + 105) / 5
= 107/5