If you mistakenly add 10 to a number that should be multiplied by 10, the result is 21. How much do you get when you calculate correctly?
21 10 [OP_SUB] 10 [OP_MUL]
var_a = 21
var_b = 10
var_c = var_a - var_b
var_d = 10
var_e = var_c * var_d
print(int(var_e))