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D( x )
x+4 = 0
5*x-13 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
5*x-13 = 0
5*x-13 = 0
5*x-13 = 0 // + 13
5*x = 13 // : 5
x = 13/5
x in (-oo:-4) U (-4:13/5) U (13/5:+oo)
6/(x+4) = 12/(5*x-13) // - 12/(5*x-13)
6/(x+4)-(12/(5*x-13)) = 0
6/(x+4)-12*(5*x-13)^-1 = 0
6/(x+4)-12/(5*x-13) = 0
(6*(5*x-13))/((x+4)*(5*x-13))+(-12*(x+4))/((x+4)*(5*x-13)) = 0
6*(5*x-13)-12*(x+4) = 0
18*x-126 = 0
(18*x-126)/((x+4)*(5*x-13)) = 0
(18*x-126)/((x+4)*(5*x-13)) = 0 // * (x+4)*(5*x-13)
18*x-126 = 0
18*x-126 = 0 // + 126
18*x = 126 // : 18
x = 126/18
x = 7
x = 7
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