Помогите.
Запишите выражение равным не содержащим скобок.
1)a+(-b)
2)a-(-b)
3)-c+(-a)
4)-x-(-y)
5)a-(-b)+(-c)
6)-x+(-y)+(-z)-d
7)a-c-(-b)-(-d)
8)a-(-x)+(-y)-(-c)
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