$\"\"$

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The differential equation is $\"\"$ .

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Multiply each side by $\"\"$ .

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$\"\"$

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Add $\"\"$ to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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

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So, it is a linear equation.

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$\"\"$

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