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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
3/(x-6) = 7 // - 7
3/(x-6)-7 = 0
3/(x-6)+(-7*(x-6))/(x-6) = 0
3-7*(x-6) = 0
45-7*x = 0
(45-7*x)/(x-6) = 0
(45-7*x)/(x-6) = 0 // * x-6
45-7*x = 0
45-7*x = 0 // - 45
-7*x = -45 // : -7
x = -45/(-7)
x = 45/7
x = 45/7
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