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u in (-oo:+oo)
6*u-(1/5) = (-5/3)*u-(7/5) // - (-5/3)*u-(7/5)
6*u-((-5/3)*u)-(1/5)+7/5 = 0
6*u+(5/3)*u-1/5+7/5 = 0
23/3*u+6/5 = 0 // - 6/5
23/3*u = -6/5 // : 23/3
u = -6/5/23/3
u = -18/115
u = -18/115
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