No. 45 over 15 and 21 over seven are equivalent though.
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21/45= 7/15
21 / 45 = 7 / 15 seven fifteenths 7 over 15
25/45 + 21/45 = 46/45 or 1 and 1/45
45/21 = 15/7
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.