2x=√(1-3x)
***************
The other person's solutions,
are WRONG!!
For the RADICAND, 1 - 3x, we have:
So, we get:
, with
<==== Up to this point is CORRECT!
(x + 1)(4x - 1) = 0
x + 1 = 0 OR 4x - 1 = 0
Although both solutions
, x = - 1 is EXTRANEOUS, and so, ONLY VALID/ACCEPTABLE solution is: 