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u in (-oo:+oo)
-1/2 = (-2/5)*u-(5/3) // - (-2/5)*u-(5/3)
5/3-((-2/5)*u)-1/2 = 0
(2/5)*u-1/2+5/3 = 0
2/5*u+7/6 = 0 // - 7/6
2/5*u = -7/6 // : 2/5
u = -7/6/2/5
u = -35/12
u = -35/12
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