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Упрости выражения.

1. \({309z+(315+124z)-7\,\mathrlap{\,+}}\) \({+ (12z+\,324)=}\) [ ].
2. \({(234+114c)-72c+1120\,\mathrlap{\,+}}\) \({ +\,(13c-18)=}\) [ ].
3. \({1315+(101d-860)-81d\,\mathrlap{\,+}}\) \({ +\,987=}\) [ ].