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u in (-oo:+oo)
-1/2 = (-2/5)*u-(4/3) // - (-2/5)*u-(4/3)
4/3-((-2/5)*u)-1/2 = 0
(2/5)*u-1/2+4/3 = 0
2/5*u+5/6 = 0 // - 5/6
2/5*u = -5/6 // : 2/5
u = -5/6/2/5
u = -25/12
u = -25/12
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