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u in (-oo:+oo)
(7/5)*u-((3/5)*u) = -2/3-(2/3) // + -2/3-(2/3)
(7/5)*u-((3/5)*u)-(-2/3)+2/3 = 0
(7/5)*u+(-3/5)*u+2/3+2/3 = 0
4/5*u+4/3 = 0 // - 4/3
4/5*u = -4/3 // : 4/5
u = -4/3/4/5
u = -5/3
u = -5/3
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