Because you can divide both 15 and 35 by 5. Equivalent fractions are just multiples.
3/7
6/14
9/21
12/28
15/35
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35/15 = 7/3
15/35 = 3/7
35/15 = 7/3 the convert to the mixed number: 2 1/3
9 over 15 is equal to 3 over 5.
An expression equal to 15 + 35, using distributive property, is 5(3 + 7). Under distributive property, 5*3=15 and 5*7=35.