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x in (-oo:+oo)
9/y = (85/10)*x // - (85/10)*x
9/y-((85/10)*x) = 0
(-17/2)*x+9/y = 0
9*y^-1-17/2*x = 0 // - 9*y^-1
-17/2*x = -(9*y^-1) // : -17/2
x = (-(9*y^-1))/(-17/2)
x = 18/17*y^-1
x = 18/17*y^-1
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