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x in (-oo:+oo)
-(7*(x/9-(23/9)))-x = 9 // - 9
-(7*(x/9-(23/9)))-x-9 = 0
-7*(x/9-23/9)-x-9 = 0
-7*(1/9*x-23/9)-x-9 = 0
-7*(1/9*x-23/9)-x-9 = 0
161/9-16/9*x-9 = 0
80/9-16/9*x = 0
80/9-16/9*x = 0
80/9-16/9*x = 0 // - 80/9
-16/9*x = -80/9 // : -16/9
x = -80/9/(-16/9)
x = 5
x = 5
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