Yes it is cuz 7 and 45 have no common factors.
1x45=45, 5x9=45. 1x7=7
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7/45
45/21 = 15/7
3/7
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 3, 21/45 is equal to 7/15 or seven fifteenths.
43/45 is in its simplest form.