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x in (-oo:+oo)
(8/9)*x^1*y = 2/3 // - 2/3
(8/9)*x^1*y-(2/3) = 0
(8/9)*x*y-2/3 = 0
8/9*x*y-2/3 = 0 // + 2/3
8/9*x*y = 2/3 // : 8/9*y
x = 2/3/(8/9*y)
x = 3/4*y^-1
x = 3/4*y^-1
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