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D( x )
64^-3*x = 0
64^-3*x = 0
64^-3*x = 0
1/262144*x = 0 // : 1/262144
x = 0
x in (-oo:0) U (0:+oo)
((1/4)^2*x-2)/(64^-3*x) = 4^3 // - 4^3
((1/4)^2*x-2)/(64^-3*x)-4^3 = 0
(1/16*x-2)/(1/262144*x)-64 = 0
(1/16*x-2)/(1/262144*x)+(-64*1/262144*x)/(1/262144*x) = 0
1/16*x-64*1/262144*x-2 = 0
255/4096*x-2 = 0
(255/4096*x-2)/(1/262144*x) = 0
(255/4096*x-2)/(1/262144*x) = 0 // * x/262144
255/4096*x-2 = 0
255/4096*x-2 = 0 // + 2
255/4096*x = 2 // : 255/4096
x = 2/255/4096
x = 8192/255
x = 8192/255
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