1) The expression is $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ ---------------> (1) \ \

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ -------------------> (2) \ \

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Multiply equation (1)*3.2 and equation (2) * 2.8 and adding

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$\"\"$