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D( x )
(5*x-13)*(x+8) = 0
(5*x-13)*(x+8) = 0
(5*x-13)*(x+8) = 0
( 5*x-13 )
5*x-13 = 0 // + 13
5*x = 13 // : 5
x = 13/5
( x+8 )
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:13/5) U (13/5:+oo)
(5*x)/((5*x-13)*(x+8)) = 0
5*x = 0 // : 5
x = 0
x = 0
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