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x in (-oo:+oo)
10^3-(((25*x)/5)*x) = 0
10^3-5*x^2 = 0
-5*x^2 = -1000 // : -5
x^2 = 200
x^2 = 200 // ^ 1/2
abs(x) = 10*2^(1/2)
x = 10*2^(1/2) or x = -(10*2^(1/2))
x in { 10*2^(1/2), -(10*2^(1/2)) }
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