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D( x )
10*x+5 = 0
10*x+5 = 0
10*x+5 = 0
10*x+5 = 0 // - 5
10*x = -5 // : 10
x = -5/10
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
((5*x)/(10*x+5))*((4*x+2)/5) = 0
(5*x*(4*x+2))/(5*(10*x+5)) = 0
( 4*x+2 )
4*x+2 = 0 // - 2
4*x = -2 // : 4
x = -2/4
x = -1/2
( 5*x )
5*x = 0 // : 5
x = 0
x in { -1/2}
x = 0
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