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u in (-oo:+oo)
u/4-((3*u)/8) = u/16 // - u/16
u/4-((3*u)/8)-(u/16) = 0
u/4+(-3/8)*u-(u/16) = 0
-3/16*u = 0 // : -3/16
u = 0
u = 0
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