For example:
(1) (4 + 7) + 13 = 11 + 13 = 24 and 4 + (7 + 13) = 4 + 20 = 24
: (4 + 7) + 13 = 4 + (7 + 13).
(it) [(-5) + 7] + (-6) = 2 + (-6) = -4 and (-5) + [7 + (-6)] = (-5) +
. [(-5) + 7] + (-6) = (-5) + [7 + (-6)].
non dron brackets and we write
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