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x in (-oo:+oo)
x^2-((6/5)*x^2)-x-(15*x)-50 = 0
x^2+(-6/5)*x^2-x-15*x-50 = 0
-1/5*x^2-16*x-50 = 0
DELTA = (-16)^2-(-50*(-1/5)*4)
DELTA = 216
DELTA > 0
x = (216^(1/2)+16)/(-1/5*2) or x = (16-216^(1/2))/(-1/5*2)
x = -5/2*(6*6^(1/2)+16) or x = -5/2*(16-6*6^(1/2))
x in { -5/2*(6*6^(1/2)+16), -5/2*(16-6*6^(1/2)) }
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