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u in (-oo:+oo)
-23 = -u/9 // + -u/9
-(-u/9)-23 = 0
(1/9)*u-23 = 0
1/9*u-23 = 0 // + 23
1/9*u = 23 // : 1/9
u = 23/1/9
u = 207
u = 207
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