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u in (-oo:+oo)
-1/2 = (-4/7)*u-(5/4) // - (-4/7)*u-(5/4)
5/4-((-4/7)*u)-1/2 = 0
(4/7)*u-1/2+5/4 = 0
4/7*u+3/4 = 0 // - 3/4
4/7*u = -3/4 // : 4/7
u = -3/4/4/7
u = -21/16
u = -21/16
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