Deliver a duplicate section of code into a separate part.

Hello everyone

I see there is duplication in my cases

Could you help me to optimize it?

using System;
namespace _3_??
{
public delegate int BinaryOp(int x, int y);
public class SimpleMath
{
public static int Add(int x, int y)
{ return x + y; }
public static int Subtract(int x, int y)
{ return x - y; }
}
class Program
{
static void Main(string[] args)
{
BinaryOp b = new BinaryOp(SimpleMath.Add);
BinaryOp w = new BinaryOp(SimpleMath.Subtract);
string operationRes;
Console.WriteLine("What operations you wonna checkup? (addition/subtraction, write a/s to choose): ");
operationRes = Console.ReadLine();
Console.WriteLine("Insert first number");
int x = (Convert.ToInt16(Console.ReadLine()));
Console.WriteLine("Insert second number");
int y = (Convert.ToInt16(Console.ReadLine()));
switch (operationRes)
{
case "a":
Console.WriteLine("Insert sum of x and y");
int userresult = (Convert.ToInt16(Console.ReadLine()));
int pcresult = b(x, y);
if (userresult > pcresult)
Console.WriteLine("Something wrong with your calculations, man..." + "\n" + "Your result should be less...");
else if (userresult < pcresult)
Console.WriteLine("Something wrong with your calculations, man..." + "\n" + "Your result should be more...");
else
Console.WriteLine("Y've inserted right result!");
break;
case "s":
Console.WriteLine("Insert substraction of x and y");
int userresult2 = (Convert.ToInt16(Console.ReadLine()));
int pcresult2 = w(x, y);
if (userresult2 > pcresult2)
Console.WriteLine("Something wrong with your calculations, man..." + "\n" + "Your result should be less...");
else if (userresult2 < pcresult2)
Console.WriteLine("Something wrong with your calculations, man..." + "\n" + "Your result should be more...");
else
Console.WriteLine("Y've inserted right result!");
break;
default:
break;
}
}
}
}