The width of the square paper is 8 centimeters (cm). If the perimeter is 40 centimeters (cm), how long is the length?
40 2 [OP_DIV] 8 [OP_SUB]
var_a = 40
var_b = 2
var_c = var_a / var_b
var_d = 8
var_e = var_c - var_d
print(int(var_e))