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u in (-oo:+oo)
20 = (-5/9)*u // - (-5/9)*u
20-((-5/9)*u) = 0
(5/9)*u+20 = 0
5/9*u+20 = 0 // - 20
5/9*u = -20 // : 5/9
u = -20/5/9
u = -36
u = -36
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