If you add a number twice to 0.46, you get 0.72. What number is it?
0.72 0.46 [OP_SUB] 0.46 [OP_SUB]
var_a = 0.72
var_b = 0.46
var_c = var_a - var_b
var_d = 0.46
var_e = var_c - var_d
print('{:.2f}'.format(round(var_e+1e-10,2)))