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