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If
1
2
+
2
5
s
=
s

3
4
2
1

+
5
2

s=s−
4
3

start fraction, 1, divided by, 2, end fraction, plus, start fraction, 2, divided by, 5, end fraction, s, equals, s, minus, start fraction, 3, divided by, 4, end fraction , what is the value of
s
ss?