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Find a horizontal line that divides an area into two equal parts.

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Find a horizontal line that divides an area between y=x^2 and y=9 into two equal parts.

I need help in approaching this problem. I know how to calculate the area. I divided the area by two and through trial and error I found the horizontal line to be close to y=5.6. I don't know how to get an exact answer.

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A horizontal line that divides an area into two equal parts is found.

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