Yeonju received 1/4 of the total number of notebooks, and Minji received 3/7. If there were 28 notebooks, how many notebooks are left?
28 1 1/4 [OP_SUB] 3/7 [OP_SUB] [OP_MUL]
var_a = 28
var_b = 1
var_c = 0.25
var_d = var_b - var_c
var_e = 0.42857142857142855
var_f = var_d - var_e
var_g = var_a * var_f
print(int(var_g))