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u in (-oo:+oo)
(5/2)*(u+3) = (6/7)*u+19 // - (6/7)*u+19
(5/2)*(u+3)-((6/7)*u)-19 = 0
(5/2)*(u+3)+(-6/7)*u-19 = 0
5/2*(u+3)+(-6*u)/7-19 = 0
(5/2*7*(u+3))/7+(-6*u)/7+(-19*7)/7 = 0
5/2*7*(u+3)-6*u-19*7 = 0
23/2*u-133+105/2 = 0
23/2*u-161/2 = 0
(23/2*u-161/2)/7 = 0
(23/2*u-161/2)/7 = 0 // * 7
23/2*u-161/2 = 0
23/2*u-161/2 = 0 // + 161/2
23/2*u = 161/2 // : 23/2
u = 161/2/23/2
u = 7
u = 7
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