A rectangle has a perimeter of 30 centimeters (cm) and a width of 10 centimeters (cm). How long is the length of this rectangle?
30 2 [OP_DIV] 10 [OP_SUB]
var_a = 30
var_b = 2
var_c = var_a / var_b
var_d = 10
var_e = var_c - var_d
print(int(var_e))