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(a + 3b) + (a + 4b) = 55
2a + 7b = 55
U₉ - 724U₆ = 58
(a + 8b) - 724(a + 5b) = 58
-723a - 3612b = 58
eliminasi:
2a +7b = 55 (x 516) >> 1032a + 3612b = 28380
-723a - 3612b = 58 >> -723a - 3612b = 58
_____________________ +
309a = 28438
a = 92,03
b = -18,43
S₇ = (7/2)(2(92,03) + 6(-18,43))