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D( x )
x^2-(3*x)-10 = 0
x^2-4 = 0
x^2-(3*x)-10 = 0
x^2-(3*x)-10 = 0
x^2-3*x-10 = 0
x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(1*2) or x = (3-49^(1/2))/(1*2)
x = 5 or x = -2
x^2-4 = 0
x^2-4 = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in (-oo:-2) U (-2:2) U (2:5) U (5:+oo)
2/(x^2-4)-(5/(x^2-(3*x)-10)) = 0
2/(x^2-4)-5*(x^2-3*x-10)^-1 = 0
2/(x^2-4)-5/(x^2-3*x-10) = 0
x^2-3*x-10 = 0
x^2-3*x-10 = 0
x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(1*2) or x = (3-49^(1/2))/(1*2)
x = 5 or x = -2
(x+2)*(x-5) = 0
2/(x^2-4)-5/((x+2)*(x-5)) = 0
(2*(x+2)*(x-5))/((x^2-4)*(x+2)*(x-5))+(-5*(x^2-4))/((x^2-4)*(x+2)*(x-5)) = 0
2*(x+2)*(x-5)-5*(x^2-4) = 0
-3*x^2-6*x = 0
-3*x^2-6*x = 0
-3*x*(x+2) = 0
x+2 = 0 // - 2
x = -2
-3*x*(x+2) = 0
(-3*x*(x+2))/((x^2-4)*(x+2)*(x-5)) = 0
(-3*x*(x+2))/((x^2-4)*(x+2)*(x-5)) = 0 // * (x^2-4)*(x+2)*(x-5)
-3*x*(x+2) = 0
( -3*x )
-3*x = 0 // : -3
x = 0
( x+2 )
x+2 = 0 // - 2
x = -2
x in { -2}
x = 0
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