Log(x-1)+log(x-3)=log(x-1)

Log(x-1)+log(x-3)=log(x-1)
log(x-1)(x-3)=log(x-1)
lognya sama sama dicoret, jadi
(x-1)(x-3)=(x-1)
x²-4x+3=x-1
x²-5x+4=0
(x-4)(x-1)=0
x=4/x=1
Solution sets = {1,4}