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u in (-oo:+oo)
(7/5)*u-5 = (-2/3)*u-(4/5) // - (-2/3)*u-(4/5)
(7/5)*u-((-2/3)*u)+4/5-5 = 0
(7/5)*u+(2/3)*u+4/5-5 = 0
31/15*u-21/5 = 0 // + 21/5
31/15*u = 21/5 // : 31/15
u = 21/5/31/15
u = 63/31
u = 63/31
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