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D( x )
5*x+25 = 0
x = 0
5*x+25 = 0
5*x+25 = 0
5*x+25 = 0 // - 25
5*x = -25 // : 5
x = -25/5
x = -5
x = 0
x = 0
x in (-oo:-5) U (-5:0) U (0:+oo)
((10-x)/(5*x+25))/x = 0
(10-x)/(x*(5*x+25)) = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x = 10
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