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