$\"\"$

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The word $\"\"$ sum $\"\"$ means addition operation and its symbol is $\"\"$ .

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The words $\"\"$ difference or decreased $\"\"$ means subtraction operation and its symbol is $\"\"$ .

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The word $\"\"$ times $\"\"$ means multiplication operation and its symbol is $\"\"$ .

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The word $\"\"$ the difference of x and 2 $\"\"$ represents $\"\"$ .

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The word $\"\"$ three times the difference of x and 2 $\"\"$ represents $\"\"$ .

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The word $\"\"$ the sum of x and 10 $\"\"$ represents $\"\"$ .

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The word $\"\"$ three times the difference of x and 2, decreased by the sum of x and 10 $\"\"$ represents $\"\"$ . $\"\"$

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The expression is $\"\"$ .

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Apply distributive property: $\"\"$ .

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$\"\"$

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$\"\"$

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Apply distributive property: $\"\"$ .

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$\"\"$

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Group like terms.

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$\"\"$

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Combine like terms.

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$\"\"$ . $\"\"$

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The expression is $\"\"$ and simplified expression is $\"\"$ .