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u in (-oo:+oo)
(2/3)*u+(5/3)*u = 5/3+5/3 // - 5/3+5/3
(2/3)*u+(5/3)*u-(5/3)-(5/3) = 0
(2/3)*u+(5/3)*u-5/3-5/3 = 0
7/3*u-10/3 = 0 // + 10/3
7/3*u = 10/3 // : 7/3
u = 10/3/7/3
u = 10/7
u = 10/7
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