To simplify the expression \( 3(2x + 6) - 2(4x - 5) \), we will follow the steps of distributing, combining like terms, and simplifying.
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Distribute \( 3 \) into \( (2x + 6) \): \[ 3 \cdot 2x + 3 \cdot 6 = 6x + 18 \]
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Distribute \( -2 \) into \( (4x - 5) \): \[ -2 \cdot 4x + (-2) \cdot -5 = -8x + 10 \]
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Now, substitute the distributed terms back into the expression: \[ 6x + 18 - 8x + 10 \]
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Combine like terms (combine \( 6x \) and \( -8x \), and combine \( 18 \) and \( 10 \)): \[ (6x - 8x) + (18 + 10) = -2x + 28 \]
So, the simplified expression is: \[ -2x + 28 \]
Thus the final answer is: \[ \boxed{-2x + 28} \]