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u in (-oo:+oo)
1/2 = (-7/2)*u-(9/4) // - (-7/2)*u-(9/4)
1/2-((-7/2)*u)+9/4 = 0
(7/2)*u+1/2+9/4 = 0
7/2*u+11/4 = 0 // - 11/4
7/2*u = -11/4 // : 7/2
u = -11/4/7/2
u = -11/14
u = -11/14
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