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x in (-oo:+oo)
A = ((2*90)/100)*x^100 // - ((2*90)/100)*x^100
A-(((2*90)/100)*x^100) = 0
A+(-9/5)*x^100 = 0
-9/5*x^100 = -A // : -9/5
x^100 = 5/9*A
x^100 = 5/9*A // ^ 1/100
abs(x) = (5/9)^(1/100)*A^(1/100)
x = (5/9)^(1/100)*A^(1/100) or x = -((5/9)^(1/100)*A^(1/100))
x in { (5/9)^(1/100)*A^(1/100), -((5/9)^(1/100)*A^(1/100)) }
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