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x in (-oo:+oo)
(-4/5)*x+(1/3)*x-5-1 = (6/15)*x^2-(28*x)+5 // - (6/15)*x^2-(28*x)+5
(-4/5)*x-((6/15)*x^2)+(1/3)*x+28*x-5-5-1 = 0
(-2/5)*x^2+(-4/5)*x+(1/3)*x+28*x-5-5-1 = 0
413/15*x-2/5*x^2-11 = 0
DELTA = (413/15)^2-(-11*(-2/5)*4)
DELTA = 166609/225
DELTA > 0
x = ((166609/225)^(1/2)-413/15)/(-2/5*2) or x = (-(166609/225)^(1/2)-413/15)/(-2/5*2)
x = -5/4*((166609/225)^(1/2)-413/15) or x = 5/4*((166609/225)^(1/2)+413/15)
x in { -5/4*((166609/225)^(1/2)-413/15), 5/4*((166609/225)^(1/2)+413/15) }
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