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u in (-oo:+oo)
-8/5 = (-1/2)*u-(8/3) // - (-1/2)*u-(8/3)
8/3-((-1/2)*u)-8/5 = 0
(1/2)*u-8/5+8/3 = 0
1/2*u+16/15 = 0 // - 16/15
1/2*u = -16/15 // : 1/2
u = -16/15/1/2
u = -32/15
u = -32/15
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