NO!, that is NOT right:
x+25/x = 10 Put the LHS over the common denominator x
[x^2 + 25] / x = 10 Cross multiply
x^2 + 25 = 10x Subtract 10x from both sides
x^2 - 10x + 25 =0 Write the LHS as a square
(x - 5)^2 = 0 Take the square of both sides
x - 5 = 0 Add 5 to both sides
x = 5 - Both roots are the same
x = 5
Sum = 5 + 5 =10