If ax+by=cax + by = cax+by=c has a solution, what is the value of gcd(ka,kb)\gcd(ka, kb)gcd(ka,kb) in terms of d=gcd(a,b)d = \gcd(a, b)d=gcd(a,b) for k>0k > 0k>0?
ddd
kdkdkd
k/dk/dk/d
d/kd/kd/k