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x in (-oo:+oo)
(1/(2^3))*x = 8^2 // - 8^2
(1/(2^3))*x-8^2 = 0
1/8*x-64 = 0 // + 64
1/8*x = 64 // : 1/8
x = 64/1/8
x = 512
x = 512
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