Solve for $k$.
\[
C=\frac{k+r}{2}
\]
Answer
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Answer
The solution for k in terms of C and r is \(\boxed{k = 2C - r}\)
Steps
Step 1 ：Multiply both sides of the equation by 2: \(2C = k + r\)
Step 2 ：Subtract r from both sides of the equation to isolate k: \(k = 2C - r\)
Step 3 ：The solution for k in terms of C and r is \(\boxed{k = 2C - r}\)
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