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Mathematics
Problem
The infinite geometric series
7
+
7
x
+
7
x
2
+
7
x
3
+
⋯
7 + 7x + 7x^2 + 7x^3 + \text{⋯}
7
+
7
x
+
7
x
2
+
7
x
3
+
⋯
has sum
28
28
28
. Find the value of
x
x
x
.
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