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(x-1)^3= (1/8)/(-8/27)
(x-1)^3=-27/64
x-1=raiz 3 de (-27/64)
x-1=-3/4
x=-3/4 + 1
x=1/4
verificación
-8/27 (1/4-1)^3=1/8
-8/27(-3/4)^3=1/8
-8/27 * -27/64 = 1/8
1/8 = 1/8