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u in (-oo:+oo)
(7/5)*u-(4/5) = (-1/2)*u-3 // - (-1/2)*u-3
(7/5)*u-((-1/2)*u)-(4/5)+3 = 0
(7/5)*u+(1/2)*u-4/5+3 = 0
19/10*u+11/5 = 0 // - 11/5
19/10*u = -11/5 // : 19/10
u = -11/5/19/10
u = -22/19
u = -22/19
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