The sequence -6, 12, -18, 24, -30, 36, ... is obtained from the positive multiples of 6, the terms multiplying by -1 in the odd positions. Note in the figure that the sum of the first two terms of the sequence is equal to 6 and the sum of the first three terms is equal to -12. How many consecutive terms of this sequence we must add, from the first, to get 180 as a result?

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