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1 + 7 + 13 + 19 + 25 + x = 280
65 + x = 280 || -65
x = 215
1 + 7 + 13 + 19 + … + x = 280
1 + 7 + 13 + 19 + 25 + x = 280
65 + x = 280
280 - 65 = 215
1 + 7 + 13 + 19 + 25 + 215 =280