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u in (-oo:+oo)
(1/2)*u-4/3 = -8/7 // + -8/7
(1/2)*u-4/3-(-8/7) = 0
(1/2)*u-4/3+8/7 = 0
1/2*u-4/21 = 0 // + 4/21
1/2*u = 4/21 // : 1/2
u = 4/21/1/2
u = 8/21
u = 8/21
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