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7 9. X-18,7>9,7. 7/9:Х=7/18. Х 7 18 2 3 7 9. 7*9:X=7.
X-18,7>9,7. 7/9:Х=7/18. Х 7 18 2 3 7 9. 7*9:X=7.

See also