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525. 5 + 4 = 9 + 67 = 73 + 98 = 171 + 12 = 183 + 34 = 217 + 11 = 229 + 51 = 280 + 90 = 370 + 47 = 417 + 8 = 525.
The common difference is 13 because 21-8=13, 34-21=13, and 34-47=13.
(3x2) +27 +++34 = 6+27+34= 67 []
47 plus 39 gives 86.
63 plus 47 plus 42 plus 21 is equal to 173.