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u in (-oo:+oo)
-16 = (-4/9)*u // - (-4/9)*u
-((-4/9)*u)-16 = 0
(4/9)*u-16 = 0
4/9*u-16 = 0 // + 16
4/9*u = 16 // : 4/9
u = 16/4/9
u = 36
u = 36
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