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u in (-oo:+oo)
5*u-(2/3) = (-7/3)*u-(1/2) // - (-7/3)*u-(1/2)
5*u-((-7/3)*u)-(2/3)+1/2 = 0
5*u+(7/3)*u-2/3+1/2 = 0
22/3*u-1/6 = 0 // + 1/6
22/3*u = 1/6 // : 22/3
u = 1/6/22/3
u = 1/44
u = 1/44
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