$\"\"$

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The expression is $\"\"$ .

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§ Start at zero.

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§ Move 12 units to the left.

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§ From there, move 9 units to the right.

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$\"\"$ $\"\"$

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Rewrite the expression.

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$\"\"$

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$\"\"$ (Product of two sames signs is positive)

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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The solution is $\"\"$ . \ \