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Answer:
x = adult tickets
(x-51)= student tickets
A total of 499 tickets were sold for the school play.
→x+(x-51)= 499
How many adult tickets were sold.
x+(x-51)= 499
x+x-51 =499
2x-51=499
2x=499+51
2x=550
x=275
275 adult tickets were sold