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15. What is the slope of the line with the equation \( 2x + 3y + 6 = 0 \) ?
A. \( - 6 \)
B. \( - 3 \)
C. \( - 2 \)
D. \( - \frac{2}{3} \)
E. \( \frac{2}{3} \)
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Answer: D