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x in (-oo:+oo)
(5/9)*x-(2*y) = 9 // - 9
(5/9)*x-(2*y)-9 = 0
(5/9)*x-2*y-9 = 0
5/9*x-2*y-9 = 0 // + -2*y-9
5/9*x = -(-2*y-9) // : 5/9
x = (-(-2*y-9))/5/9
x = 9/5*(9-(-2*y))
x = 9/5*(9-(-2*y))
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