Помогите люди добрые!
Заключить выражения в скобки!

a-b-c
-2+a-b
-x-y+5
7+x-y
-3a+2b-7c
6-5a+b
3x+9y-4z
-15-7x-2y
0,2a-0,5b+c
-0,5-0,3x+y
-1,3x-2,5y+z
3,7-2,1a-1,4b
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