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u in (-oo:+oo)
(1/3)*u-5 = (-7/5)*u-(1/3) // - (-7/5)*u-(1/3)
(1/3)*u-((-7/5)*u)+1/3-5 = 0
(1/3)*u+(7/5)*u+1/3-5 = 0
26/15*u-14/3 = 0 // + 14/3
26/15*u = 14/3 // : 26/15
u = 14/3/26/15
u = 35/13
u = 35/13
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