(k-1)(1-t)=k/3
k-kt-1+t=k/3
3k-3kt-3+3t=k
2k-3kt=3-3t
(2-3t)k=3-3t
k=(3-3t)/(2-3t)
k=(3t-3)/(3t-2)
もっと綺麗にできそうですが、とりあえずこれでできます。
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