m + (2 - c) = m + 2 - c
(a - 3) + b = a - 3 + b
- (8 - n) = - 8 + n
7 - (- t + p) = 7 + t - p
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m + (2 - c) = m + 2 - c
(a - 3) + b = a - 3 + b
- (8 - n) = - 8 + n
7 - (- t + p) = 7 + t - p