-3
15 + 3 - 6 / 2 * 6 = 15 + 3 - 3 * 6 = 15 + 3 - 18 = 18 - 18 = 0
72
15
3 + 3 = 6 6 x 3 = 18 18 - 3 = 15 15 + 3 = 18
4x+6-7x+9=18-3x+15=18-3x=3x=-1
5/6 + 2/18 = 15/18 + 2/18 = 17/18
3+6+9+12+15+18+21+24+27+30+33+36 = 234
1/5 + 6/18 = 1/5 + 1/3 = 3/15 + 5/15 = 8/15
8/9 + 5/6 = 16/18 + 15/18 = 31/18
It is: 18+6+6+6+6+9 = 51
6 plus 6 plus 6 is 18. It is the same as 6 x 3 = 18
2/3 + 1/9 + 5/6 = 12/18 + 2/18 + 15/18 = 29/18 = 111/18