If you are going to divide the RHS by ln(4), then the -2ln(4) term becomes just -2.

You removed the parenthesis but didn't cancel out that term.

Btw, the easier way to solve this is just

log_4 (200) = x + 2

Then use change of base formula to compute log_4 (200). You'll get the same answer either way, but save a few steps.