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Yes it is cuz 7 and 45 have no common factors. 1x45=45, 5x9=45. 1x7=7
45/63 45 ÷ 9 = 5 63 ÷ 9 = 7 so 45/63 = 5/7; 5 to 7; 5:7
No - 45 / 7 produces a fractional result - 45 / 7 = 6.428571 recurring or 6 and three sevenths.
-45/7 = -6.428571
7/45