Why the answer is 19?

Question

#include <iostream>
using namespace std;

int main()
{

int x=4;
int y=++x + ++x + ++x;
cout<<y;
return 0;
// answer is 19
}

Can someone explain why is 19? I got 18.
Here is how I did:
x=x+1. 4+1=5
x=x+1. 5+1=6
x=x+1. 6+1=7
y=x+x+x. y=5+6+7=18
What am I doing wrong?

Answer 1

Jacob Burgess I am guessing kms does not stand for kilometres?

Answer 2

++x = 1+4 = 5
1+4 = 5
+ ++x = 1+1+5 = 7
5+2 = 7
+ ++x = 1+1+5 = 7
7+2 = 7
ans. 5+7+7 = 19
final ans. 19

Answer 3

Answer = 5 + 5 + 9 = 19

Answer 4

Hw these area available guys

Answer 5

It's purely compiler dependent

Answer 6

x= x+1 => 4+1=5
x= x => 5
y= x +1 + x => 10
y=(x +1+ (x +1))+ 1 => y = 11
x =((( x + 1)+1)+1 ) + 1=> x = 8
y = 8 + 11 = 19