I've set these two things equal to each other: I've got one equation and one unknown.
我让两个方程相等,只剩下了一个等式和一个未知数
I'm sorry, I don't understand since the left hand side of your equation does not equal the right hand side, isn't that discount, not price?
对不起,我不太理解,这里等式左边和等式右边,并不相等,这里应该是折扣率而非价格
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