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x in (-oo:+oo)
0 = (1/25)*x^2-36 // - (1/25)*x^2-36
0-((1/25)*x^2)+36 = 0
(-1/25)*x^2+0+36 = 0
-1/25*x^2 = -36 // : -1/25
x^2 = 900
x^2 = 900 // ^ 1/2
abs(x) = 30
x = 30 or x = -30
x in { 30, -30 }
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