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u in (-oo:+oo)
(-5/3)*u+3 = (-3/5)*u-(4/5) // - (-3/5)*u-(4/5)
(-5/3)*u-((-3/5)*u)+4/5+3 = 0
(-5/3)*u+(3/5)*u+4/5+3 = 0
19/5-16/15*u = 0 // - 19/5
-16/15*u = -19/5 // : -16/15
u = -19/5/(-16/15)
u = 57/16
u = 57/16
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