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u in (-oo:+oo)
1/3-((1/2)*u) = -2/5 // + -2/5
1/3-((1/2)*u)-(-2/5) = 0
(-1/2)*u+1/3+2/5 = 0
11/15-1/2*u = 0 // - 11/15
-1/2*u = -11/15 // : -1/2
u = -11/15/(-1/2)
u = 22/15
u = 22/15
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