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The direct variation formula is $\"\"$ .

Substitute y = 6 and x = 10.

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Divide each side by 10.

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The direct variation equation is $\"\"$ . $\"\"$

Find the value of x, substitute y = 18 in $\"\"$ .

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Multiply each side by 5.

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Divide each side by 3.

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The value of $\"\"$ .