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u in (-oo:+oo)
(-3/5)*u-(5/2) = -8/3 // + -8/3
(-3/5)*u-(5/2)-(-8/3) = 0
(-3/5)*u-5/2+8/3 = 0
1/6-3/5*u = 0 // - 1/6
-3/5*u = -1/6 // : -3/5
u = -1/6/(-3/5)
u = 5/18
u = 5/18
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