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D( x )
(5*x+5)^2 = 0
(5*x+5)^2 = 0
(5*x+5)^2 = 0
5*x+5 = 0 // - 5
5*x = -5 // : 5
x = -5/5
x = -1
x in (-oo:-1) U (-1:+oo)
((5-(5*x))^2)/((5*x+5)^2) = 25 // - 25
((5-(5*x))^2)/((5*x+5)^2)-25 = 0
((5-5*x)^2)/((5*x+5)^2)-25 = 0
((5-5*x)^2)/((5*x+5)^2)+(-25*(5*x+5)^2)/((5*x+5)^2) = 0
(5-5*x)^2-25*(5*x+5)^2 = 0
-600*x^2-1300*x-600 = 0
-600*x^2-1300*x-600 = 0
-100*(6*x^2+13*x+6) = 0
6*x^2+13*x+6 = 0
DELTA = 13^2-(4*6*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)-13)/(2*6) or x = (-25^(1/2)-13)/(2*6)
x = -2/3 or x = -3/2
-100*(x+3/2)*(x+2/3) = 0
(-100*(x+3/2)*(x+2/3))/((5*x+5)^2) = 0
(-100*(x+3/2)*(x+2/3))/((5*x+5)^2) = 0 // * (5*x+5)^2
-100*(x+3/2)*(x+2/3) = 0
( x+2/3 )
x+2/3 = 0 // - 2/3
x = -2/3
( x+3/2 )
x+3/2 = 0 // - 3/2
x = -3/2
x in { -2/3, -3/2 }
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