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x in (-oo:+oo)
2*x = (5*x^2)/6 // - (5*x^2)/6
2*x-((5*x^2)/6) = 0
(-5/6)*x^2+2*x = 0
2*x-5/6*x^2 = 0
DELTA = 2^2-(-5/6*0*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)-2)/(-5/6*2) or x = (-4^(1/2)-2)/(-5/6*2)
x = 0 or x = 12/5
x in { 0, 12/5 }
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