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u in (-oo:+oo)
(-1/2)*u-(8/5) = -7/3 // + -7/3
(-1/2)*u-(8/5)-(-7/3) = 0
(-1/2)*u-8/5+7/3 = 0
11/15-1/2*u = 0 // - 11/15
-1/2*u = -11/15 // : -1/2
u = -11/15/(-1/2)
u = 22/15
u = 22/15
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