If \( f: R \rightarrow R \) satisfies \( f(x+y)=f(x)+f(y) \), for a...

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If \( f: R \rightarrow R \) satisfies \( f(x+y)=f(x)+f(y) \), for all \( x, y \in R \) and \( f(1)=2 \), then \( \sum_{r=1}^{7} f(r) \) is :
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