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(1/10)*x^2 = 11/10-x^2 // - 11/10-x^2
(1/10)*x^2+x^2-(11/10) = 0
(1/10)*x^2+x^2-11/10 = 0
11/10*x^2 = 11/10 // : 11/10
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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