You don't. There's no question there, and nothing that needs solving.
If it were equal to something, then we could find what number 'x' must be.
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Your equation is not clear I can understand it in two ways (x2-16)/x-4+x2=16 x=-4.59486 x=-0.793499 x=4.38835 or x2-(16/x)-4+x2=16 x=3.50466 x=-0.864641 x=-2.64002
x=9 squared
(x + 2)(x - 4)
x(x - 2)
3 squared = 9 4 squared = 16 9 x 16 = 144 3 squared x 4 squared = 144