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x in (-oo:+oo)
(((-1/4)*(x-8)^1)/2)*(x+2) = x+9 // - x+9
(((-1/4)*(x-8)^1)/2)*(x+2)-x-9 = 0
(((-1/4)*(x-8))/2)*(x+2)-x-9 = 0
(-1/4*(x-8)*(x+2))/2-x-9 = 0
(-1/4*(x-8)*(x+2))/2+(2*(-x))/2+(-9*2)/2 = 0
2*(-x)-1/4*(x-8)*(x+2)-9*2 = 0
4-1/4*x^2-1/2*x-18 = 0
-1/4*x^2-1/2*x-14 = 0
-1/4*x^2-1/2*x-14 = 0
-1*(1/4*x^2+1/2*x+14) = 0
1/4*x^2+1/2*x+14 = 0
DELTA = (1/2)^2-(1/4*4*14)
DELTA = -55/4
DELTA < 0
-1 = 0
-1/2 = 0
-1/2 = 0 // * 2
-1 = 0
x belongs to the empty set
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