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4911+87 = 420

CristianAvila 6+7=13 ok

911 -plus 42087 = 8712

Add 6 will be in plus, with #, add 7, its...... 6+7=67 that's it! Ok

Add a number in a secoial piece then it goes cap, on 12 girl, add 9 its... 420+129=911. Then you go the same number.