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x in (-oo:+oo)
x*((4*x+5)/2) = -3 // + 3
x*((4*x+5)/2)+3 = 0
(x*(4*x+5))/2+3 = 0
(x*(4*x+5))/2+(2*3)/2 = 0
x*(4*x+5)+2*3 = 0
4*x^2+5*x+6 = 0
4*x^2+5*x+6 = 0
4*x^2+5*x+6 = 0
DELTA = 5^2-(4*4*6)
DELTA = -71
DELTA < 0
1 = 0
1/2 = 0
1/2 = 0 // * 2
1 = 0
x belongs to the empty set
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