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u in (-oo:+oo)
(1/9)*u-(2/3) = 3/5-1 // - 3/5-1
(1/9)*u-(2/3)-(3/5)+1 = 0
(1/9)*u-2/3-3/5+1 = 0
1/9*u-4/15 = 0 // + 4/15
1/9*u = 4/15 // : 1/9
u = 4/15/1/9
u = 12/5
u = 12/5
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