Which equation is non- linear

x + 1 = 2 x - 3

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9 - 5 x^{2} = 4

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- 2 x - 5 - (x + 4) = - 9

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x - \frac{1}{15} = 2

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Solution

The correct option is D $9 - 5 x^{2} = 4$
Linear equations are those which have the degree of equation as $1$

Here every equation has the degree as $1$

Except $9 - 5 x^{2} = 4$

So its is not a linear equation

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