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u in (-oo:+oo)
-7/3 = (-1/2)*u-(8/5) // - (-1/2)*u-(8/5)
8/5-((-1/2)*u)-7/3 = 0
(1/2)*u-7/3+8/5 = 0
1/2*u-11/15 = 0 // + 11/15
1/2*u = 11/15 // : 1/2
u = 11/15/1/2
u = 22/15
u = 22/15
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