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