Let $x$ be a value such that $9x^2 - 18x - 16 = 0$ and $15x^2 + 28x + 12 = 0.$ What is the value of $x$? Express your answer as a simplified common fraction.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $x$ be a value such that $9x^2 - 18x - 16 = 0$ and $15x^2 + 28x + 12 = 0.$ What is the value of $x$? Express your answer as a simplified common fraction.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-\dfrac{2}{3}
Let $x$ be a value such that $9x^2 - 18x - 16 = 0$ and $15x^2 + 28x + 12 = 0.$ What is the value of $x$? Express your answer as a simplified common fraction.
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