No - since the numbers 13 and 42 share no common factors other than 1, the fraction 13/42 is already expressed in its simplest form.
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13 and 14/42 = 13 and 1/3
13/42 = 0.3095238 recurring (that is, 0.3095238095238...)
13/42 is in its simplest form.
You change it into a fraction form ( 42 over 100) and reduce.
18/35 + 13/42 = 1211/1470 or 173/210