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