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u in (-oo:+oo)
20 = (-5/3)*u // - (-5/3)*u
20-((-5/3)*u) = 0
(5/3)*u+20 = 0
5/3*u+20 = 0 // - 20
5/3*u = -20 // : 5/3
u = -20/5/3
u = -12
u = -12
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