To simplify the expression \(2x + 5y + 3x + 7y\), we need to combine like terms.
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Combine the \(x\) terms: \(2x + 3x = 5x\)
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Combine the \(y\) terms: \(5y + 7y = 12y\)
Now we combine these results:
The expression simplifies to: \[ 5x + 12y \]
So the answer is: 5x + 12y