There were some tangerines in the basket. Eunji ate 9 pieces, and mother put 5 more in the basket, and it became 20 pieces. How many tangerines were in the basket at the beginning?
20 9 [OP_ADD] 5 [OP_SUB]
var_a = 20
var_b = 9
var_c = var_a + var_b
var_d = 5
var_e = var_c - var_d
print(int(var_e))