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u in (-oo:+oo)
(1/3)*u-(8/5) = -5/2 // + -5/2
(1/3)*u-(8/5)-(-5/2) = 0
(1/3)*u-8/5+5/2 = 0
1/3*u+9/10 = 0 // - 9/10
1/3*u = -9/10 // : 1/3
u = -9/10/1/3
u = -27/10
u = -27/10
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