2 times the sum of cows and pigs is 32. If there are 7 cows, how many pigs are there?
32 2 [OP_DIV] 7 [OP_SUB]
var_a = 32
var_b = 2
var_c = var_a / var_b
var_d = 7
var_e = var_c - var_d
print(int(var_e))