I'm going to make some assumptions here:
That your sqrt8x= sqrt4+2x means √(8x) = √(4+2x). (There are other interpretations.)
Squaring both sides, 8x = 4 + 2x, or 6x = 4, or x = 4/6, or x = 2/3.
I set it up as an equation. 1/4x = 1/7x + 3. After you solve it out, it’s 28.
Answer:

Step-by-step explanation:

Remove parenthesis:

Separate the constants:

Simplify:

