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u in (-oo:+oo)
-((3/8)*u) = 12 // - 12
-((3/8)*u)-12 = 0
(-3/8)*u-12 = 0
-3/8*u-12 = 0 // + 12
-3/8*u = 12 // : -3/8
u = 12/(-3/8)
u = -32
u = -32
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