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D( x )
x+5 = 0
2*x+10 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
2*x+10 = 0
2*x+10 = 0
2*x+10 = 0 // - 10
2*x = -10 // : 2
x = -10/2
x = -5
x in (-oo:-5) U (-5:+oo)
(x-8)/(x+5) = (x-1)/(2*x+10) // - (x-1)/(2*x+10)
(x-8)/(x+5)-((x-1)/(2*x+10)) = 0
(x-8)/(x+5)+(-1*(x-1))/(2*x+10) = 0
((x-8)*(2*x+10))/((x+5)*(2*x+10))+(-1*(x-1)*(x+5))/((x+5)*(2*x+10)) = 0
(x-8)*(2*x+10)-1*(x-1)*(x+5) = 0
x^2-10*x-75 = 0
x^2-10*x-75 = 0
x^2-10*x-75 = 0
DELTA = (-10)^2-(-75*1*4)
DELTA = 400
DELTA > 0
x = (400^(1/2)+10)/(1*2) or x = (10-400^(1/2))/(1*2)
x = 15 or x = -5
(x+5)*(x-15) = 0
((x+5)*(x-15))/((x+5)*(2*x+10)) = 0
((x+5)*(x-15))/((x+5)*(2*x+10)) = 0 // * (x+5)*(2*x+10)
(x+5)*(x-15) = 0
( x+5 )
x+5 = 0 // - 5
x = -5
( x-15 )
x-15 = 0 // + 15
x = 15
x in { -5}
x = 15
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