5-(а+3) = 5-а-3 = 2-а
8-(10+в) = 8-10-в = -2-в
9-(с+7) = 9-с-7 = 2-с
2+(-8+с) = 2-8+с = -6+с
3+(-d-5) = 3-d-5 = -2-d
4+(а-9) = 4+а-9 = -5+а
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5-(а+3) = 5-а-3 = 2-а
8-(10+в) = 8-10-в = -2-в
9-(с+7) = 9-с-7 = 2-с
2+(-8+с) = 2-8+с = -6+с
3+(-d-5) = 3-d-5 = -2-d
4+(а-9) = 4+а-9 = -5+а