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x in (-oo:+oo)
y = (2*x^1)/(2^3) // - (2*x^1)/(2^3)
y-((2*x^1)/(2^3)) = 0
y-2*2^-3*x = 0
y-1/4*x = 0 // - y
-1/4*x = -y // : -1/4
x = -y/(-1/4)
x = 4*y
x = 4*y
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