The number of solutions of the equation <img alt="\log_{4}\left ( x-1 \right )=\log_{2}\left ( x-3 \right )" src="https://entrancecorner.codecogs.com/gif.latex?%5Clog_%7B4%7D%5Cleft%20%28%20x-1%20%5Cright%20%29%3D%5Clog_%7B2%7D%5Cleft%20%28%20x-3%20%5C