The circumference of an equilateral triangle is said to be four times 21 centimeters (cm). What is the length of one side of this equilateral triangle?
21 4 [OP_MUL] 3 [OP_DIV]
var_a = 21
var_b = 4
var_c = var_a * var_b
var_d = 3
var_e = var_c / var_d
print(int(var_e))