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u in (-oo:+oo)
-((1/3)*u)-2/5 = 1/4 // - 1/4
-((1/3)*u)-2/5-(1/4) = 0
(-1/3)*u-2/5-1/4 = 0
-1/3*u-13/20 = 0 // + 13/20
-1/3*u = 13/20 // : -1/3
u = 13/20/(-1/3)
u = -39/20
u = -39/20
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