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D( x )
x-10 = 0
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x in (-oo:10) U (10:+oo)
(6*x-12)/(x-10)-((4*x+8)/(x-10)) = 0
(6*x-12)/(x-10)+(-1*(4*x+8))/(x-10) = 0
6*x-1*(4*x+8)-12 = 0
2*x-20 = 0
(2*x-20)/(x-10) = 0
(2*x-20)/(x-10) = 0 // * x-10
2*x-20 = 0
2*x-20 = 0 // + 20
2*x = 20 // : 2
x = 20/2
x = 10
x in { 10}
x belongs to the empty set
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