Finally, to detect any , the obtained value can be checked by substituting it into the original equation.
4log2(x−1)+6=14
4log2(5−1)+6=?14
4log24+6=?14
4(log2log4)+6=?14
4(2)+6=?14
8+6=?14
14=14 ✓
A true statement was obtained, so the solution is not extraneous.