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x in (-oo:+oo)
(((-1/10)*(x-20)^1)/2)*(x+2) = x+9 // - x+9
(((-1/10)*(x-20)^1)/2)*(x+2)-x-9 = 0
(((-1/10)*(x-20))/2)*(x+2)-x-9 = 0
(-1/10*(x-20)*(x+2))/2-x-9 = 0
(-1/10*(x-20)*(x+2))/2+(2*(-x))/2+(-9*2)/2 = 0
2*(-x)-1/10*(x-20)*(x+2)-9*2 = 0
4-1/10*x^2-1/5*x-18 = 0
-1/10*x^2-1/5*x-14 = 0
-1/10*x^2-1/5*x-14 = 0
-1*(1/10*x^2+1/5*x+14) = 0
1/10*x^2+1/5*x+14 = 0
DELTA = (1/5)^2-(1/10*4*14)
DELTA = -139/25
DELTA < 0
-1 = 0
-1/2 = 0
-1/2 = 0 // * 2
-1 = 0
x belongs to the empty set
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