See, I've defined f of x to be a function x=x+1 that takes a value of x in, changes x to x+1, x and then just returns the value.

我定义了f是一个函数,输入x，让，然后输出。

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This point here then is the present value of your income; it's Y today + / .

直线与x轴的交点表示收入的现值,它等于

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