Нужно упростить выражения.
1). 12а - 17в + 13в - 12а + 2а
2). -3•(2а+5с)+ 4•(с-3а)-2•(-5а-6с)
3). 23m-21n+16n-13m-6n
4). -2•(3a+6c)+8•(c-a)-3•(6a-7c)
Помогите пж!
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