It looks like
a=a+b;
a=a-b;
b=a-b
 
should be replaced with
a=a+b;
b=a-b;
a=a-b;
 
(just swap the 2nd and 3rd lines)
 
so if both a and b are 10,
a=10+20; //now a=20, b=10
b=20-10; //now a=20, b=10
a=20-10; //now a=10, b=10
 
if a=10, b= 5
a=10+5; //a=15, b=5
b=15-5; //a=15, b=10
a=15-10; //a=5, b=10


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