If $$\frac{a}{b}=\frac{3}{4}$$ what is $$\frac{a+b}{b-a}$$

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If $$\frac{a}{b}=\frac{3}{4}$$ what is $$\frac{a+b}{b-a}$$

A、-7
B、-1
C、$$\frac{1}{7}$$
D、1
E、7

答案：E

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