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