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D( x )
x+4 = 0
x-3 = 0
(x-3)*(x+4) = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
(x-3)*(x+4) = 0
(x-3)*(x+4) = 0
( x+4 )
x+4 = 0 // - 4
x = -4
( x-3 )
x-3 = 0 // + 3
x = 3
x in (-oo:-4) U (-4:3) U (3:+oo)
x/((x-3)*(x+4)) = 2/(x-3)-(5/(x+4)) // - 2/(x-3)-(5/(x+4))
x/((x-3)*(x+4))-(2/(x-3))+5/(x+4) = 0
x/((x-3)*(x+4))-2*(x-3)^-1+5/(x+4) = 0
x/((x-3)*(x+4))-2/(x-3)+5/(x+4) = 0
x/((x-3)*(x+4))+(-2*(x+4))/((x-3)*(x+4))+(5*(x-3))/((x-3)*(x+4)) = 0
5*(x-3)-2*(x+4)+x = 0
5*x-x-15-8 = 0
4*x-23 = 0
(4*x-23)/((x-3)*(x+4)) = 0
(4*x-23)/((x-3)*(x+4)) = 0 // * (x-3)*(x+4)
4*x-23 = 0
4*x-23 = 0 // + 23
4*x = 23 // : 4
x = 23/4
x = 23/4
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