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u in (-oo:+oo)
-2*u-(7/3) = (2/3)*u-(7/5) // - (2/3)*u-(7/5)
7/5-2*u-((2/3)*u)-(7/3) = 0
(-2/3)*u-2*u-7/3+7/5 = 0
-8/3*u-14/15 = 0 // + 14/15
-8/3*u = 14/15 // : -8/3
u = 14/15/(-8/3)
u = -7/20
u = -7/20
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