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x in (-oo:+oo)
x^2-(5*x)-(5*x)-(50/50) = 0
x^2-5*x-5*x-1 = 0
x^2-10*x-1 = 0
DELTA = (-10)^2-(-1*1*4)
DELTA = 104
DELTA > 0
x = (104^(1/2)+10)/(1*2) or x = (10-104^(1/2))/(1*2)
x = (2*26^(1/2)+10)/2 or x = (10-2*26^(1/2))/2
x in { (10-2*26^(1/2))/2, (2*26^(1/2)+10)/2 }
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