For this case we have the expression:
"the square root of 4" is represented algebraically as:

Then, we can express the given statement as:

They are similar terms, we can subtract:

By definition of power properties we have that:
![\sqrt [n] {a ^ n} = a ^ {\frac {n} {n}} = a](https://tex.z-dn.net/?f=%5Csqrt%20%5Bn%5D%20%7Ba%20%5E%20n%7D%20%3D%20a%20%5E%20%7B%5Cfrac%20%7Bn%7D%20%7Bn%7D%7D%20%3D%20a)
Then the expression is reduced to:

Answer:

The answers in order are
Y= 10/4
Y=5/3
8 + 4 = 3x
12 = 3x
divide both sides by 3
x= 4