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x in (-oo:+oo)
(1/2)^3*x = 2*8 // - 2*8
(1/2)^3*x-(2*8) = 0
(1/2)^3*x-16 = 0
1/8*x-16 = 0 // + 16
1/8*x = 16 // : 1/8
x = 16/1/8
x = 128
x = 128
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