Question 902897
 x+squareroot of x=20 Let X = sqrt(x)
X^2 + X - 20 = 0
(X +5)(X-4) = 0
X = 4, x = {{{  highlight_green(16) }}} 
Note:
X = -5, x = 25  Does not work in original EQ: 25 + 5 ≠ 20