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u in (-oo:+oo)
u/8-((7*u)/2) = u/16 // - u/16
u/8-((7*u)/2)-(u/16) = 0
u/8+(-7/2)*u-(u/16) = 0
-55/16*u = 0 // : -55/16
u = 0
u = 0
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