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One possible proportion to solve for x is:
4 pages / 6 minutes = 9 pages / x minutes
By cross multiplying, we have:
4x = 6 * 9
4x = 54
Dividing by 4 on both sides, we get:
x = 54 / 4 = 13.5
Therefore, it will take Solomon 13.5 minutes to read 9 pages.