42 divided by 6 in repeated subtraction
42 - 6 = 36 - 136 - 6 = 30 - 230 - 6 = 24 - 324 - 6 = 18 - 418 - 6 = 12 - 512 - 6 = 6 - 66 - 6 = 0 - 7
42/6 = 7
42-6=3636-6=3030-6=2424-6=1818-6=1212-6=66-6=0