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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
3/5 = (x-5)/(x+4) // - (x-5)/(x+4)
3/5-((x-5)/(x+4)) = 0
(-1*(x-5))/(x+4)+3/5 = 0
(-1*5*(x-5))/(5*(x+4))+(3*(x+4))/(5*(x+4)) = 0
3*(x+4)-1*5*(x-5) = 0
37-2*x = 0
(37-2*x)/(5*(x+4)) = 0
(37-2*x)/(5*(x+4)) = 0 // * 5*(x+4)
37-2*x = 0
37-2*x = 0 // - 37
-2*x = -37 // : -2
x = -37/(-2)
x = 37/2
x = 37/2
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