The sum of 4 sides of a rectangle equals 50 centimeters (cm). If the length of this rectangle is 13 centimeters (cm), what is the length of its width in centimeters (cm)?
50 2 [OP_DIV] 13 [OP_SUB]
var_a = 50
var_b = 2
var_c = var_a / var_b
var_d = 13
var_e = var_c - var_d
print(int(var_e))