log2 x = log 4x +6

this is a question my teacher gave us, the she gave this the first equation on starting the question which is below

log2x = log2x +6 / log24

how did my teacher got this, i need to know because i am presently studing for an exam

PS the 2 and 4 is subscrip SORRY AND final log24 only the 2 is subscript