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u in (-oo:+oo)
5/2 = (-9/7)*u-(5/4) // - (-9/7)*u-(5/4)
5/2-((-9/7)*u)+5/4 = 0
(9/7)*u+5/2+5/4 = 0
9/7*u+15/4 = 0 // - 15/4
9/7*u = -15/4 // : 9/7
u = -15/4/9/7
u = -35/12
u = -35/12
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