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U in (-oo:+oo)
12 = (4/7)*U // - (4/7)*U
12-((4/7)*U) = 0
(-4/7)*U+12 = 0
12-4/7*U = 0 // - 12
-4/7*U = -12 // : -4/7
U = -12/(-4/7)
U = 21
U = 21
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