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u in (-oo:+oo)
-9/5 = (-1/2)*u-(9/7) // - (-1/2)*u-(9/7)
9/7-((-1/2)*u)-9/5 = 0
(1/2)*u-9/5+9/7 = 0
1/2*u-18/35 = 0 // + 18/35
1/2*u = 18/35 // : 1/2
u = 18/35/1/2
u = 36/35
u = 36/35
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