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x in (-oo:+oo)
x/9-((3*x)/11) = -80 // + 80
x/9-((3*x)/11)+80 = 0
x/9+(-3/11)*x+80 = 0
80-16/99*x = 0 // - 80
-16/99*x = -80 // : -16/99
x = -80/(-16/99)
x = 495
x = 495
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