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D( x )
x-5 = 0
x-6 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:5) U (5:6) U (6:+oo)
(7*x+6)/(x-6) = (6*x-5)/(x-5) // - (6*x-5)/(x-5)
(7*x+6)/(x-6)-((6*x-5)/(x-5)) = 0
(7*x+6)/(x-6)+(-1*(6*x-5))/(x-5) = 0
((7*x+6)*(x-5))/((x-6)*(x-5))+(-1*(6*x-5)*(x-6))/((x-6)*(x-5)) = 0
(7*x+6)*(x-5)-1*(6*x-5)*(x-6) = 0
x^2+12*x-60 = 0
x^2+12*x-60 = 0
x^2+12*x-60 = 0
DELTA = 12^2-(-60*1*4)
DELTA = 384
DELTA > 0
x = (384^(1/2)-12)/(1*2) or x = (-384^(1/2)-12)/(1*2)
x = (8*6^(1/2)-12)/2 or x = (-8*6^(1/2)-12)/2
(x-((-8*6^(1/2)-12)/2))*(x-((8*6^(1/2)-12)/2)) = 0
((x-((-8*6^(1/2)-12)/2))*(x-((8*6^(1/2)-12)/2)))/((x-6)*(x-5)) = 0
((x-((-8*6^(1/2)-12)/2))*(x-((8*6^(1/2)-12)/2)))/((x-6)*(x-5)) = 0 // * (x-6)*(x-5)
(x-((-8*6^(1/2)-12)/2))*(x-((8*6^(1/2)-12)/2)) = 0
( x-((-8*6^(1/2)-12)/2) )
x-((-8*6^(1/2)-12)/2) = 0 // + (-8*6^(1/2)-12)/2
x = (-8*6^(1/2)-12)/2
( x-((8*6^(1/2)-12)/2) )
x-((8*6^(1/2)-12)/2) = 0 // + (8*6^(1/2)-12)/2
x = (8*6^(1/2)-12)/2
x in { (-8*6^(1/2)-12)/2, (8*6^(1/2)-12)/2 }
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