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2v(u+1)t=2(u+1)+2v-u(u+1)
2v(u+1)t=2u+2+2v-u²-u
2v(u+1)t=u+2-u²+2v
2v(u+1)t-2v=u+2-u²
2v((u+1)t-1)=u+2-u²
v =(u+2-u²)/2(ut+t-1)