3 + 4 = - 16 12 18
3 + 4 = - 5 45 7
12 + 6 = - 2 18 22
7 + 7 = - 14 24 8
5 – 2 = - 1 3 4
10 – 8 = - 18 2 12
15 – 6 = - 4 9 10
20 – 12 = - 7 9 8
50 – 30 = - 30 40 20