$\"\"$

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The function is $\"\"$ .

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The general form of linear equation is $\"\"$ .

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Rewrite the equation.

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$\"\"$

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Divide each side by $\"\"$ .

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$\"\"$

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$\"\"$

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The above equation is in the form of $\"\"$ .

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Hence, the equation $\"\"$ is linear equation.

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$\"\"$

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The equation $\"\"$ is linear equation.