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D( x )
x^2-36 = 0
x^2-36 = 0
x^2-36 = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in (-oo:-6) U (-6:6) U (6:+oo)
(x^2-(5*x)-6)/(x^2-36) = 0
(x^2-5*x-6)/(x^2-36) = 0
x^2-5*x-6 = 0
x^2-5*x-6 = 0
DELTA = (-5)^2-(-6*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(1*2) or x = (5-49^(1/2))/(1*2)
x = 6 or x = -1
(x+1)*(x-6) = 0
((x+1)*(x-6))/(x^2-36) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-6 )
x-6 = 0 // + 6
x = 6
x in { 6}
x = -1
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