Post Increment and pre incement closed

Question

output is a=34 and x=13 can anyone plzz explain
#include <iostream>
using namespace std;
int main()
{
int x = 10, a;
a = x++ + ++x + x++;
cout << "Post Increment Operation";
cout << "\na = " << a;
cout << "\nx = " << x;
return 0;
}