To simplify the expression \( 7x - 3 + 2x + 6 \), we can combine like terms.
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Combine the \( x \) terms: \( 7x + 2x = 9x \)
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Combine the constant terms: \( -3 + 6 = 3 \)
Putting it all together, we get: \[ 9x + 3 \]
Thus, the simplified expression is \( 9x + 3 \).
The correct answer is C \( 9x + 3 \).