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\"\"

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The expression is \"\".

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\"\"            (Substitute a = 3, b = 0.3, c =\"\", d = \"\")

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\"\"

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First operation is multiplication.

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\"\"           (Multiply: \"\")

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Next operation is subtraction.

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\"\"           (Subtract: \"\")

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Numerator value is zero the expression value becomes zero.

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\"\"                            

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\"\"

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The value of the expression is 0.

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