Let's simplify the expression step by step.
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Start with the expression: \[ -6(12-15) + 2^3 \]
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Calculate the expression inside the parentheses: \[ 12 - 15 = -3 \]
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Now substitute that back into the expression: \[ -6(-3) + 2^3 \]
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Multiply: \[ -6 \times -3 = 18 \]
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Now calculate \(2^3\): \[ 2^3 = 8 \]
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Add the results together: \[ 18 + 8 = 26 \]
Thus, the final result is: \[ \boxed{26} \]