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Let x = Year he was born
.
Then from:"if 237 is subtracted from his birth year divided by 3, and if this number is now divided by 5, then the result is 83" we get our equation:
(x/3 - 237)/5 = 83
multiplying both sides by 5 we get:
(x/3 - 237) = 415
adding 237 to both sides:
x/3 = 652
finally multiplying both sides by 3:
x = 1956