SOLUTION: 400 +500 =600+ [__] WHAT IS ANSWER

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Question 435870: 400 +500 =600+ [__]
WHAT IS ANSWER
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
400 + 500 = 600 + x
900 = 600 + x

x = 300