The father is 5 times Taehyung's age, and the mother is 4 times Taehyung's age. If Taehyung is 9 years old, how many years younger is his mother than his father?
9 5 [OP_MUL] 9 4 [OP_MUL] [OP_SUB]
var_a = 9
var_b = 5
var_c = var_a * var_b
var_d = 9
var_e = 4
var_f = var_d * var_e
var_g = var_c - var_f
print(int(var_g))