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D( x )
5*x+16 = 0
5*x+16 = 0
5*x+16 = 0
5*x+16 = 0 // - 16
5*x = -16 // : 5
x = -16/5
x in (-oo:-16/5) U (-16/5:+oo)
((5*x)/(5*x+16))*(x-3) = 0
(5*x*(x-3))/(5*x+16) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 0, 3 }
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