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x in (-oo:+oo)
25 = (1/16)*x^2 // - (1/16)*x^2
25-((1/16)*x^2) = 0
(-1/16)*x^2+25 = 0
-1/16*x^2 = -25 // : -1/16
x^2 = 400
x^2 = 400 // ^ 1/2
abs(x) = 20
x = 20 or x = -20
x in { 20, -20 }
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