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u in (-oo:+oo)
(-1/2)*u-(2/5) = 6*u-(7/5) // - 6*u-(7/5)
(-1/2)*u-(6*u)-(2/5)+7/5 = 0
(-1/2)*u-6*u-2/5+7/5 = 0
1-13/2*u = 0 // - 1
-13/2*u = -1 // : -13/2
u = -1/(-13/2)
u = 2/13
u = 2/13
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