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D( x )
8*x+5 = 0
(8*x+5)^2 = 0
8*x+5 = 0
8*x+5 = 0
8*x+5 = 0 // - 5
8*x = -5 // : 8
x = -5/8
(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)
6*((3*x)/(8*x+5))^5*(15/((8*x+5)^2)) = 0
(6*15*(3*x)^5)/((8*x+5)^7) = 0
3*x = 0 // : 3
x = 0
x in { 0, 0, 0, 0, 0 }
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