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u in (-oo:+oo)
48 = (3/8)*u // - (3/8)*u
48-((3/8)*u) = 0
(-3/8)*u+48 = 0
48-3/8*u = 0 // - 48
-3/8*u = -48 // : -3/8
u = -48/(-3/8)
u = 128
u = 128
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