What is the answer4+5=?+4 is it 9 or

Please help me cause my wife thinks she is right and I want to prove her to be wrong. Thanks
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1 Answer

? = 5   because 4 + 5 = 5 + 4

? does not equal 9 because 4 + 5 does not equal 9 + 4
by Level 13 User (103k points)

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