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