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x in (-oo:+oo)
a*x^2 = x/a // - x/a
a*x^2-(x/a) = 0
a*x^2-(a^-1*x) = 0
a^-1*x*(a^2*x-1) = 0
a^2*x-1 = 0 // + 1
a^2*x = 1 // : a^2
x = 1/(a^2)
x/a = 0
a^-1*x = 0 // : a^-1
x = 0
x in { 1/(a^2), 0 }
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