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After interchanging + and -, 8 and 7, which one of the following becomes correct?

7 x 8 + 6 - 9 = 25
8 - 7 + 3 x 5 = 35
6 + 8 x 2 - 7 = 0
8 x 2 + 7 - 6 = 9

Correct Answer: 6 + 8 x 2 - 7 = 0

Explanation:

After changing '+' and '-' , 8 and 7 the appropriate equation is,
6 + 8 x 2 - 7 = 0
L.H.S. = 6 - 7 x 2 + 8
6 - 14 + 8
14 - 14 = 0 = R.H.S.

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