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u in (-oo:+oo)
16 = (4/5)*u // - (4/5)*u
16-((4/5)*u) = 0
(-4/5)*u+16 = 0
16-4/5*u = 0 // - 16
-4/5*u = -16 // : -4/5
u = -16/(-4/5)
u = 20
u = 20
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