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u in (-oo:+oo)
-8/7 = (1/2)*u-(4/5) // - (1/2)*u-(4/5)
4/5-((1/2)*u)-8/7 = 0
(-1/2)*u-8/7+4/5 = 0
-1/2*u-12/35 = 0 // + 12/35
-1/2*u = 12/35 // : -1/2
u = 12/35/(-1/2)
u = -24/35
u = -24/35
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