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u in (-oo:+oo)
(4/3)*u-(1/2) = -2/5 // + -2/5
(4/3)*u-(1/2)-(-2/5) = 0
(4/3)*u-1/2+2/5 = 0
4/3*u-1/10 = 0 // + 1/10
4/3*u = 1/10 // : 4/3
u = 1/10/4/3
u = 3/40
u = 3/40
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