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u in (-oo:+oo)
(1/2)*u-(3/5) = -3*u-(6/5) // + -3*u-(6/5)
(1/2)*u-(-3*u)-(3/5)+6/5 = 0
(1/2)*u+3*u-3/5+6/5 = 0
7/2*u+3/5 = 0 // - 3/5
7/2*u = -3/5 // : 7/2
u = -3/5/7/2
u = -6/35
u = -6/35
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