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u in (-oo:+oo)
(7/2)*u-1 = (-1/5)*u-(3/5) // - (-1/5)*u-(3/5)
(7/2)*u-((-1/5)*u)+3/5-1 = 0
(7/2)*u+(1/5)*u+3/5-1 = 0
37/10*u-2/5 = 0 // + 2/5
37/10*u = 2/5 // : 37/10
u = 2/5/37/10
u = 4/37
u = 4/37
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