c++ presedence of operators

Question

Hi guys so I need some help understanding how these compound assignment operators work for example

int x=6;
x += x -= x * x;

x turns out to be -60 can someone explain why and how this works?

Answer 1

Ignoring UB with sequence points:

x += x -= x * x;

is

(x += (x -= (x * x)));

so

x * x -> 36

x -= 36 -> x = -30

x += -30 -> x = -60