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D( x )
x+5 = 0
2*x-3 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in (-oo:-5) U (-5:3/2) U (3/2:+oo)
3/(2*x-3) = 2/(x+5) // - 2/(x+5)
3/(2*x-3)-(2/(x+5)) = 0
3/(2*x-3)-2*(x+5)^-1 = 0
3/(2*x-3)-2/(x+5) = 0
(3*(x+5))/((2*x-3)*(x+5))+(-2*(2*x-3))/((2*x-3)*(x+5)) = 0
3*(x+5)-2*(2*x-3) = 0
21-x = 0
(21-x)/((2*x-3)*(x+5)) = 0
(21-x)/((2*x-3)*(x+5)) = 0 // * (2*x-3)*(x+5)
21-x = 0
21-x = 0 // - 21
-x = -21 // * -1
x = 21
x = 21
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