Verified Answer :

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x + x+1 + x+2 = 426   /-3

x + x + x = 423  /:3

x = 141

1) 141
2) 141+1
3) 141+2

Check: 141 + 142 + 143 = 426

Answer: 141, 142, 143

If the numbers are all the same the answer is 142

142x3=426

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