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x in (-oo:+oo)
0.6*2*10 = (150*x^2)/2 // - (150*x^2)/2
0.6*2*10-((150*x^2)/2) = 0
0.6*2*10-75*x^2 = 0
-75*x^2 = -12 // : -75
x^2 = 4/25
x^2 = 4/25 // ^ 1/2
abs(x) = 2/5
x = 2/5 or x = -2/5
x in { 2/5, -2/5 }
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