Let's solve the expression step by step:
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Start with the expression: \[ (7 - 3) \cdot 7 \cdot 7206^{-2} \]
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Calculate \( 7 - 3 \): \[ 7 - 3 = 4 \]
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Replace \( 7 - 3 \) in the expression: \[ 4 \cdot 7 \cdot 7206^{-2} \]
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Now calculate \( 4 \cdot 7 \): \[ 4 \cdot 7 = 28 \]
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The expression now is: \[ 28 \cdot 7206^{-2} \]
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Now compute \( 7206^{-2} \): \[ 7206^{-2} = \frac{1}{7206^2} \]
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Substitute this back into the expression: \[ 28 \cdot \frac{1}{7206^2} = \frac{28}{7206^2} \]
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We need to calculate \( 7206^2 \): \[ 7206^2 = 51,264,036 \]
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Thus, the expression simplifies to: \[ \frac{28}{51,264,036} \]
This is already in the form of an improper fraction. Therefore, the final answer is: \[ \frac{28}{51,264,036} \]