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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x+35)/x = 25/15 // - 25/15
(x+35)/x-(25/15) = 0
(x+35)/x-5/3 = 0
(3*(x+35))/(3*x)+(-5*x)/(3*x) = 0
3*(x+35)-5*x = 0
105-2*x = 0
(105-2*x)/(3*x) = 0
(105-2*x)/(3*x) = 0 // * 3*x
105-2*x = 0
105-2*x = 0 // - 105
-2*x = -105 // : -2
x = -105/(-2)
x = 105/2
x = 105/2
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