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Which of the following equations is not equivalent to

25 x^{2} = y^{2} - 4

25 x^{2} + 4 = y^{2}

75 x^{2} = 3 y^{2} - 12

25 x^{2} = (y + 2) (y - 2)

5 x = y - 2

None of the above

ANS : 4

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