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u in (-oo:+oo)
(-4/5)*u = 10*(2/5) // - 10*(2/5)
(-4/5)*u-(10*(2/5)) = 0
(-4/5)*u-4 = 0
-4/5*u-4 = 0 // + 4
-4/5*u = 4 // : -4/5
u = 4/(-4/5)
u = -5
u = -5
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