How the answer will come 8?

Question

I am not getting,how to solve this?

var a=1,x;
x=++a + ++a;
x +=a;
alert(x);

Plz explain

Answer 1

first time,
line 1 ,a=1
line 2 ,x=++a+ ++a (here first time a=2 and second time a=3 ) so x=2+3 =5
line 3 x+=a (a=3 now and x=5 before .So in this line x=5+3 =8
so the value of x is 8

Answer 2

Alphin K Sajan
This question is from challenges ,so i dont think it should be worng🤔