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D( x )
4-4*x = 0
4-4*x = 0
4-4*x = 0
4-4*x = 0 // - 4
-4*x = -4 // : -4
x = -4/(-4)
x = 1
x in (-oo:1) U (1:+oo)
(-16*x)/(4-4*x) = 0
-16*x = 0 // : -16
x = 0
x = 0
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