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u in (-oo:+oo)
-1/2 = (-1/3)*u-(7/5) // - (-1/3)*u-(7/5)
7/5-((-1/3)*u)-1/2 = 0
(1/3)*u-1/2+7/5 = 0
1/3*u+9/10 = 0 // - 9/10
1/3*u = -9/10 // : 1/3
u = -9/10/1/3
u = -27/10
u = -27/10
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