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x in (-oo:+oo)
1/36-x^2 = 0
-1*x^2 = -1/36 // : -1
x^2 = 1/36
x^2 = 1/36 // ^ 1/2
abs(x) = 1/6
x = 1/6 or x = -1/6
x in { 1/6, -1/6 }
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