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D( x )
x^2-(2*x)-15 = 0
x^2-(9*x)+20 = 0
x^2-(2*x)-15 = 0
x^2-(2*x)-15 = 0
x^2-2*x-15 = 0
x^2-2*x-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+2)/(1*2) or x = (2-64^(1/2))/(1*2)
x = 5 or x = -3
x^2-(9*x)+20 = 0
x^2-(9*x)+20 = 0
x^2-9*x+20 = 0
x^2-9*x+20 = 0
DELTA = (-9)^2-(1*4*20)
DELTA = 1
DELTA > 0
x = (1^(1/2)+9)/(1*2) or x = (9-1^(1/2))/(1*2)
x = 5 or x = 4
x in (-oo:-3) U (-3:4) U (4:5) U (5:+oo)
(x-3)/(x^2-(2*x)-15)-((4-x)/(x^2-(9*x)+20)) = 0
(x-3)/(x^2-2*x-15)-((4-x)/(x^2-9*x+20)) = 0
(x-3)/(x^2-2*x-15)+(-1*(4-x))/(x^2-9*x+20) = 0
x^2-2*x-15 = 0
x^2-2*x-15 = 0
x^2-2*x-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+2)/(1*2) or x = (2-64^(1/2))/(1*2)
x = 5 or x = -3
(x+3)*(x-5) = 0
x^2-9*x+20 = 0
x^2-9*x+20 = 0
x^2-9*x+20 = 0
DELTA = (-9)^2-(1*4*20)
DELTA = 1
DELTA > 0
x = (1^(1/2)+9)/(1*2) or x = (9-1^(1/2))/(1*2)
x = 5 or x = 4
(x-4)*(x-5) = 0
(x-3)/((x+3)*(x-5))+(-1*(4-x))/((x-4)*(x-5)) = 0
((x-3)*(x-4))/((x+3)*(x-5)*(x-4))+(-1*(4-x)*(x+3))/((x+3)*(x-5)*(x-4)) = 0
(x-3)*(x-4)-1*(4-x)*(x+3) = 0
2*x^2-8*x = 0
2*x^2-8*x = 0
2*x*(x-4) = 0
x-4 = 0 // + 4
x = 4
2*x*(x-4) = 0
(2*x*(x-4))/((x+3)*(x-5)*(x-4)) = 0
(2*x*(x-4))/((x+3)*(x-5)*(x-4)) = 0 // * (x+3)*(x-5)*(x-4)
2*x*(x-4) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-4 )
x-4 = 0 // + 4
x = 4
x in { 4}
x = 0
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