Check your math. 1/2 + 3/4 is not 1, rather 5/4
If the actual question was (x-3)/4, the process is the same, but the answer is indeed 5.
(x-3)/4 = 1/2. First multiply both sides by 4, then add 3 to both sides.
Again, your math is wrong. If 2x=-1/3, x = -1/6.
e^(1-5x) = 793, take the ln of...