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u in (-oo:+oo)
10 = (-5/9)*u // - (-5/9)*u
10-((-5/9)*u) = 0
(5/9)*u+10 = 0
5/9*u+10 = 0 // - 10
5/9*u = -10 // : 5/9
u = -10/5/9
u = -18
u = -18
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