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(k = 3 SIGMA 6) [(x(k - 2)^2 + 2)/x] = 70
(k = 3 SIGMA 6) [x(k - 2)^2]/x + [2/x] = 70
(k = 3 SIGMA 6) [(k - 2)^2 + 2/x] = 70
(3 - 2)^2 + 2/x + (4 - 2)^2 + 2/x + (5 - 2)^2 + 2/x + (6 - 2)^2 + 2/x = 70
1 + 2/x + 4 + 2/x + 9 + 2/x + 16 + 2/x = 70
30 + 8/x = 70
8/x = 40
8 = 40x
x = 8/40 = 1/5