You can put this solution on YOUR website! on cross multiplying we get 8^5x*4-16=1
we know 8=2^3,4=2^2
on applying laws of indices we get 2^15x+2=17
Applying log on both sides we get [15x+2]log2=log17
15x+2=log17/log2
15x+2=4.086
15x=2.086
x=2.086/15
x=0.139