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u in (-oo:+oo)
(6/5)*u = (2/3)*u+1/15 // - (2/3)*u+1/15
(6/5)*u-((2/3)*u)-(1/15) = 0
(6/5)*u+(-2/3)*u-1/15 = 0
8/15*u-1/15 = 0 // + 1/15
8/15*u = 1/15 // : 8/15
u = 1/15/8/15
u = 1/8
u = 1/8
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