Subtracting some number from 913 gives 514. How much is 514 minus some number?
514 913 514 [OP_SUB] [OP_SUB]
var_a = 514
var_b = 913
var_c = 514
var_d = var_b - var_c
var_e = var_a - var_d
print(int(var_e))