Just multiply numerator & denominator by the same non-zero integer to get an equivalent fraction.
For example, 7/9,
2x7 = 14
------ ------
2x9 18,
so 14/18, 21/27, 28/36, ...
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When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
One-third plus three-ninths is 2/3.7/9
Three equivalent fractions for nine tenths are 81/90 63/70 99/110
3/8 and 3/4 are not equivalent fractions
7/24