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D( x )
x+4 = 0
3*x-5 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:-4) U (-4:5/3) U (5/3:+oo)
8/(3*x-5) = 3/(x+4) // - 3/(x+4)
8/(3*x-5)-(3/(x+4)) = 0
8/(3*x-5)-3*(x+4)^-1 = 0
8/(3*x-5)-3/(x+4) = 0
(8*(x+4))/((3*x-5)*(x+4))+(-3*(3*x-5))/((3*x-5)*(x+4)) = 0
8*(x+4)-3*(3*x-5) = 0
47-x = 0
(47-x)/((3*x-5)*(x+4)) = 0
(47-x)/((3*x-5)*(x+4)) = 0 // * (3*x-5)*(x+4)
47-x = 0
47-x = 0 // - 47
-x = -47 // * -1
x = 47
x = 47
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