To simplify the expression \((h + k) - (2k - h)\), we can use the properties of operations, such as the distributive property and the associative property.
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First, distribute the negative sign across the second parentheses:
\[ (h + k) - (2k - h) = (h + k) - 2k + h \]
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Now, combine like terms. We can group the \(h\) terms and the \(k\) terms together:
\[ h + h + k - 2k = 2h + k - 2k \]
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Combine \(k\) and \(-2k\):
\[ 2h - k \]
So, the simplified result is:
\[ \mathbf{2h - k} \]