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D( x )
x+4 = 0
6*x+24 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
6*x+24 = 0
6*x+24 = 0
6*x+24 = 0 // - 24
6*x = -24 // : 6
x = -24/6
x = -4
x in (-oo:-4) U (-4:+oo)
19/(6*x+24)-(3/(x+4)) = 0
19/(6*x+24)-3*(x+4)^-1 = 0
19/(6*x+24)-3/(x+4) = 0
(19*(x+4))/((6*x+24)*(x+4))+(-3*(6*x+24))/((6*x+24)*(x+4)) = 0
19*(x+4)-3*(6*x+24) = 0
x+4 = 0
(x+4)/((6*x+24)*(x+4)) = 0
(x+4)/((6*x+24)*(x+4)) = 0 // * (6*x+24)*(x+4)
x+4 = 0
x+4 = 0 // - 4
x = -4
x in { -4}
x belongs to the empty set
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