4 * x = 408, x = 408 / 4, x = 102
a : 8 = 808, a = 808 * 8, a = 406
408 : b = 2, b = 408 / 2, b = 204
y * 3 = 309, y = 309 / 3, y = 103
609 : c = 3, c = 609 / 3, c = 203
d : 2 = 203, d = 203 * 2, d = 101