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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)
2 = -13/(2*x-6) // + -13/(2*x-6)
2-(-13/(2*x-6)) = 0
13*(2*x-6)^-1+2 = 0
13/(2*x-6)+2 = 0
13/(2*x-6)+(2*(2*x-6))/(2*x-6) = 0
2*(2*x-6)+13 = 0
4*x+1 = 0
(4*x+1)/(2*x-6) = 0
(4*x+1)/(2*x-6) = 0 // * 2*x-6
4*x+1 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
x = -1/4
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