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u in (-oo:+oo)
-(7/3) = -((3/7)*u)-(5/2) // + -((3/7)*u)-(5/2)
(3/7)*u-(7/3)+5/2 = 0
(3/7)*u-7/3+5/2 = 0
3/7*u+1/6 = 0 // - 1/6
3/7*u = -1/6 // : 3/7
u = -1/6/3/7
u = -7/18
u = -7/18
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