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u in (-oo:+oo)
1/3 = (-2/5)*u-(1/4) // - (-2/5)*u-(1/4)
1/3-((-2/5)*u)+1/4 = 0
(2/5)*u+1/3+1/4 = 0
2/5*u+7/12 = 0 // - 7/12
2/5*u = -7/12 // : 2/5
u = -7/12/2/5
u = -35/24
u = -35/24
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