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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
5/(x+1)+(3/5)*x = 0
5/(x+1)+(3*x)/5 = 0
(5^2)/(5*(x+1))+(3*x*(x+1))/(5*(x+1)) = 0
3*x*(x+1)+25 = 0
3*x^2+3*x+25 = 0
3*x^2+3*x+25 = 0
3*x^2+3*x+25 = 0
DELTA = 3^2-(3*4*25)
DELTA = -291
DELTA < 0
1 = 0
1/(5*(x+1)) = 0
1/(5*(x+1)) = 0 // * 5*(x+1)
1 = 0
x belongs to the empty set
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