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D( x )
1-(4*x) = 0
1-(4*x) = 0
1-(4*x) = 0
1-4*x = 0
1-4*x = 0 // - 1
-4*x = -1 // : -4
x = -1/(-4)
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
1/(1-(4*x)) = 2 // - 2
1/(1-(4*x))-2 = 0
1/(1-4*x)-2 = 0
1/(1-4*x)+(-2*(1-4*x))/(1-4*x) = 0
1-2*(1-4*x) = 0
8*x-1 = 0
(8*x-1)/(1-4*x) = 0
(8*x-1)/(1-4*x) = 0 // * 1-4*x
8*x-1 = 0
8*x-1 = 0 // + 1
8*x = 1 // : 8
x = 1/8
x = 1/8
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