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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
6/(x-4) = 3/8 // - 3/8
6/(x-4)-(3/8) = 0
6/(x-4)-3/8 = 0
(6*8)/(8*(x-4))+(-3*(x-4))/(8*(x-4)) = 0
6*8-3*(x-4) = 0
60-3*x = 0
(60-3*x)/(8*(x-4)) = 0
(60-3*x)/(8*(x-4)) = 0 // * 8*(x-4)
60-3*x = 0
60-3*x = 0 // - 60
-3*x = -60 // : -3
x = -60/(-3)
x = 20
x = 20
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