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D( x )
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in (-oo:3) U (3:+oo)
(0.5*(x+6))/(2*x-6) = 1 // - 1
(0.5*(x+6))/(2*x-6)-1 = 0
(0.5*(x+6))/(2*x-6)+(-1*(2*x-6))/(2*x-6) = 0
0.5*(x+6)-1*(2*x-6) = 0
9-1.5*x = 0
(9-1.5*x)/(2*x-6) = 0
(9-1.5*x)/(2*x-6) = 0 // * 2*x-6
9-1.5*x = 0
9-1.5*x = 0 // - 9
-1.5*x = -9 // : -1.5
x = -9/(-1.5)
x = 6
x = 6
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