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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
4/5*U+16 = 0 // - 16
4/5*U = -16 // : 4/5
U = -16/4/5
U = -20
U = -20
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