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2/5 + 1/3 = 2n
(6 + 5)/15 = 2n
11/15 = 2n
11/15/2/1 = n
11/30 = n
205 - n = n - 23
228 = 2n
114 = n
16 - n = n - 10
26 = 2n
13 = n
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4/2=10/x
4x = 20
x = 5
x/5 = 7/3
3x = 35
x = 35/3
(- 4)/x = 6/15
- 60 = 6x
- 10 = x
12/4 = x/2
24 = 4x
6 = x