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