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D( x )
4*(x-3) = 0
x-3 = 0
4*(x-3) = 0
4*(x-3) = 0
x-3 = 0 // + 3
x = 3
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
8/(x-3)-(1/10) = 32/(4*(x-3)) // - 32/(4*(x-3))
8/(x-3)-(32/(4*(x-3)))-(1/10) = 0
8/(x-3)-8*(x-3)^-1-1/10 = 0
8/(x-3)-8/(x-3)-1/10 = 0
(8*10)/(10*(x-3))+(-8*10)/(10*(x-3))+(-1*(x-3))/(10*(x-3)) = 0
8*10-1*(x-3)-8*10 = 0
3-x = 0
(3-x)/(10*(x-3)) = 0
(3-x)/(10*(x-3)) = 0 // * 10*(x-3)
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in { 3}
x belongs to the empty set
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