Answer:
see below
Explanation:
2/5 + 1/3 + x = 1
Get a common denominator of 15
2/5 * 3/3 + 1/3 *5/5 +x = 1
6/15 + 5/15 +x = 1
11/15 + x = 1
Subtract 11/15 from each side
11/15 +x-11/15 =15/15-11/15
x = 4/15
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