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D( x )
x+4 = 0
2*x-4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:-4) U (-4:2) U (2:+oo)
6/(x+4) = 3/(2*x-4) // - 3/(2*x-4)
6/(x+4)-(3/(2*x-4)) = 0
6/(x+4)-3*(2*x-4)^-1 = 0
6/(x+4)-3/(2*x-4) = 0
(6*(2*x-4))/((x+4)*(2*x-4))+(-3*(x+4))/((x+4)*(2*x-4)) = 0
6*(2*x-4)-3*(x+4) = 0
9*x-36 = 0
(9*x-36)/((x+4)*(2*x-4)) = 0
(9*x-36)/((x+4)*(2*x-4)) = 0 // * (x+4)*(2*x-4)
9*x-36 = 0
9*x-36 = 0 // + 36
9*x = 36 // : 9
x = 36/9
x = 4
x = 4
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