Answer:
11
Explanation:
(2x -9) + (x + 2) = 23
2x + x -9 + 2 = 23
3x - 7 = 23
3x = 23 + 7
x = 10
RS = 2x - 9
RS = (2 * 10) - 9
RS = 20 - 9
RS = 11
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