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u in (-oo:+oo)
(1/5)*u-(1/3) = 8-3 // - 8-3
(1/5)*u-(1/3)-8+3 = 0
(1/5)*u-1/3-8+3 = 0
1/5*u-16/3 = 0 // + 16/3
1/5*u = 16/3 // : 1/5
u = 16/3/1/5
u = 80/3
u = 80/3
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