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u in (-oo:+oo)
30 = (-5/9)*u // - (-5/9)*u
30-((-5/9)*u) = 0
(5/9)*u+30 = 0
5/9*u+30 = 0 // - 30
5/9*u = -30 // : 5/9
u = -30/5/9
u = -54
u = -54
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