SOLUTION:

Question 174387:
Answer by kamallohia(18) (Show Source): You can put this solution on YOUR website!
Hi
log(4x+1) - log(x+1) = log3
=> log((4x+1)/(x+1)) = log3
=> (4x+1)/(x+1) = 3
=> 4x+1 = 3x+3
=> x = 2.