The equation relates the values of two linked currencies, where R is the value in dollars of one currency and S is the value in

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问题 The equation

relates the values of two linked currencies, where R is the value in dollars of one currency and S is the value in dollars of the other currency. Which of the following equations can be used to convert dollar values from the R currency to the S currency?

选项 A、
B、
C、
D、
E、

答案A

解析 You can simplify the equation by multiplying 7 times both sides, which results in the equation

, which can be restated as 5R-15=4S+32, which can be restated as

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The equation relates the values of two linked currencies, where R is the value in dollars of one currency and S is the value in

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