来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  they must yield the same expected payoff.
  那么它们的收益必然相同
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  Here's their expected payoffs, they must be the same.
  这就是二者的预期收益 它们必然相等
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  Now, I've got one equation and one unknown,
  这样就得到了一个只有一个未知数的方程
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  and now I'm down to algebra.
  下面就要用到我们的代数知识了
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  So let me do the algebra.
  我们来解这个方程
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  I claim this expression is equal to that expression,
  我说这两个表达式是相等的
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  so simplifying a bit I'm going to get,
  化简之后就可以得到
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  you should just watch to make sure I don't get this wrong,
  你们仔细看 以防我写错了
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  I'm going to get 40Q, so this implies 40Q is equal to 60(1-Q).
  化简整理后得 40Q=60(1-Q)
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  So I took this 50 onto this side and this 20 onto that side,
  我把50右移再把20左移
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  so I have 40Q is equal to 60(1-Q)
  我就能得到40Q=60(1-Q)
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  and that implies that Q is equal to .6.
  解完之后可得Q=0.6