To simplify the expression \((14x + 6y) + (5x + 12y)\), we first combine like terms.
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Combine the \(x\) terms:
- \(14x + 5x = 19x\)
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Combine the \(y\) terms:
- \(6y + 12y = 18y\)
Now, we can express the simplified expression as: \[ 19x + 18y \]
So, the final answer is: \[ 19 ; \text{and} ; 18 \]
Thus, the coefficients are 19 (for \(x\)) and 18 (for \(y\)).