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x in (-oo:+oo)
x*((2*x-3*x)/2)+x-5 = 4 // - 4
x*((2*x-3*x)/2)+x-5-4 = 0
(x*(-x))/2+x-5-4 = 0
(x*(-x))/2+(2*x)/2+(-5*2)/2+(-4*2)/2 = 0
x*(-x)+2*x-5*2-4*2 = 0
2*x-x^2-10-8 = 0
2*x-x^2-18 = 0
2*x-x^2-18 = 0
2*x-x^2-18 = 0
DELTA = 2^2-(-18*(-1)*4)
DELTA = -68
DELTA < 0
1 = 0
1/2 = 0
1/2 = 0 // * 2
1 = 0
x belongs to the empty set
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