How this java code will work?

Question

Plz explain this code https://www.sololearn.com/post/1003075/?ref=app

Answer 1

int x = 1;
int y = 2;
y += --x + y - x;
// y = y + (--x + y - x)
// y = 2 + (0 + 2 - 0)
// y = 2 + (2)
System.out.println(y); // 4

Answer 2

if x is 1 and y is 2 to start.

then y(2) is added to (pre-decremented) x(0). Since x is now 0 the rest of the equation should make sense

2 += (1 - 1) + 2 - 0 = 4