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u in (-oo:+oo)
(1/6)*u-(4/5) = (4/5)*u-(6/5) // - (4/5)*u-(6/5)
(1/6)*u-((4/5)*u)-(4/5)+6/5 = 0
(1/6)*u+(-4/5)*u-4/5+6/5 = 0
2/5-19/30*u = 0 // - 2/5
-19/30*u = -2/5 // : -19/30
u = -2/5/(-19/30)
u = 12/19
u = 12/19
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