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u in (-oo:+oo)
(-1/2)*u-(5/2) = 5*u-(3/5) // - 5*u-(3/5)
(-1/2)*u-(5*u)-(5/2)+3/5 = 0
(-1/2)*u-5*u-5/2+3/5 = 0
-11/2*u-19/10 = 0 // + 19/10
-11/2*u = 19/10 // : -11/2
u = 19/10/(-11/2)
u = -19/55
u = -19/55
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