9 + x = 21 For x = 11

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1 Answer

Where ever you see x in the problem put in 11

9 +  x  = 21

goes to

9 + 11 = 21

but if we add 9 and 11 we get 20 and not 21.

So if you wrote the problem correctly then the answer is that the equation is false.

by Level 4 User (5.3k points)

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