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x in (-oo:+oo)
(4*x)/9-(8*y) = 5 // - 5
(4*x)/9-(8*y)-5 = 0
(4*x)/9-8*y-5 = 0
4/9*x-8*y-5 = 0 // + -8*y-5
4/9*x = -(-8*y-5) // : 4/9
x = (-(-8*y-5))/4/9
x = 9/4*(5-(-8*y))
x = 9/4*(5-(-8*y))
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