A-B-B-B=303.1. Multiplying the decimal number B by 10 equals A. get A.
303.1 10 3 [OP_SUB] [OP_DIV] 10 [OP_MUL]
var_a = 303.1
var_b = 10
var_c = 3
var_d = var_b - var_c
var_e = var_a / var_d
var_f = 10
var_g = var_e * var_f
print(int(eval('{:.2f}'.format(round(var_g+1e-10,2)))))