There is a set of two books, volumes one and two. I bought 3 sets of this book and paid 21,000 won. If the price of the first volume is 300 won more than the price of the second volume, how much is the price of the second volume?
21000 3 [OP_DIV] 300 [OP_SUB] 2 [OP_DIV]
var_a = 21000
var_b = 3
var_c = var_a / var_b
var_d = 300
var_e = var_c - var_d
var_f = 2
var_g = var_e / var_f
print(int(var_g))