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