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u in (-oo:+oo)
4/5 = (-2/3)*u-(1/2) // - (-2/3)*u-(1/2)
4/5-((-2/3)*u)+1/2 = 0
(2/3)*u+4/5+1/2 = 0
2/3*u+13/10 = 0 // - 13/10
2/3*u = -13/10 // : 2/3
u = -13/10/2/3
u = -39/20
u = -39/20
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