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u in (-oo:+oo)
(7/5)*u-(1/3) = -((1/3)*u)-2 // + -((1/3)*u)-2
(7/5)*u+(1/3)*u-(1/3)+2 = 0
(7/5)*u+(1/3)*u-1/3+2 = 0
26/15*u+5/3 = 0 // - 5/3
26/15*u = -5/3 // : 26/15
u = -5/3/26/15
u = -25/26
u = -25/26
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