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u in (-oo:+oo)
2/5-((1/2)*u) = -2/3 // + -2/3
2/5-((1/2)*u)-(-2/3) = 0
(-1/2)*u+2/5+2/3 = 0
16/15-1/2*u = 0 // - 16/15
-1/2*u = -16/15 // : -1/2
u = -16/15/(-1/2)
u = 32/15
u = 32/15
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