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  3. 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

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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