Answer:
|x| - 17 = 0
Step-by-step explanation:
there were 200 children and 500 adults at the show
7x+10y=6400
x+y=700
x=700-y
7(700-y)+10y=6400
4900-7y+10y=6400
-7y+10y=1500
3y=1500
y=500
x=700-500
x=200
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