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D( x )
(8*x+5)^2 = 0
(8*x+5)^2 = 0
(8*x+5)^2 = 0
8*x+5 = 0 // - 5
8*x = -5 // : 8
x = -5/8
x in (-oo:-5/8) U (-5/8:+oo)
(8*x^2+10*x)/((8*x+5)^2) = 0
8*x^2+10*x = 0
2*x*(4*x+5) = 0
4*x+5 = 0 // - 5
4*x = -5 // : 4
x = -5/4
2*x*(x+5/4) = 0
(2*x*(x+5/4))/((8*x+5)^2) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x+5/4 )
x+5/4 = 0 // - 5/4
x = -5/4
x in { 0, -5/4 }
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