A farmer raises 49 chickens and 37 ducks on a farm. The combined number of ducks and rabbits is 9 more than the number of chickens. How many rabbits are there?
49 9 [OP_ADD] 37 [OP_SUB]
var_a = 49
var_b = 9
var_c = var_a + var_b
var_d = 37
var_e = var_c - var_d
print(int(var_e))