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u in (-oo:+oo)
-(1/3) = -((1/2)*u)-(4/7) // + -((1/2)*u)-(4/7)
(1/2)*u-(1/3)+4/7 = 0
(1/2)*u-1/3+4/7 = 0
1/2*u+5/21 = 0 // - 5/21
1/2*u = -5/21 // : 1/2
u = -5/21/1/2
u = -10/21
u = -10/21
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