S1/(v+u) +S2/(v-u)=t
t*v^2-v(s1+s2)+u(s1-s2)-t*u^2=0
Решаем находим v=21
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S1/(v+u) +S2/(v-u)=t
t*v^2-v(s1+s2)+u(s1-s2)-t*u^2=0
Решаем находим v=21