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25. There is an equation:

Peter changes some of the "+" signs to "-" signs in the equation, making the result 11. How many ways can Peter do this? ( )
A. 0
B. 1
C. 2
D. 3
E. 4

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Official solution

D

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Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.