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x in (-oo:+oo)
0 = 2-((x^2)/2.4)-x // - 2-((x^2)/2.4)-x
(x^2)/2.4+x-2+0 = 0
(x^2)/2.4+x-2 = 0
0.41666667*x^2+x-2 = 0
DELTA = 1^2-(-2*0.41666667*4)
DELTA = 4.33333336
DELTA > 0
x = (4.33333336^(1/2)-1)/(0.41666667*2) or x = (-4.33333336^(1/2)-1)/(0.41666667*2)
x = 1.19999999*(4.33333336^(1/2)-1) or x = -1.19999999*(4.33333336^(1/2)+1)
x in { -1.19999999*(4.33333336^(1/2)+1), 1.19999999*(4.33333336^(1/2)-1) }
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