Ответ:
56+(23+а)=28
23+а=28-56
23+а=-18
а=-18-23
а=-41
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Ответ:
56+(23+а)=28
23+а=28-56
23+а=-18
а=-18-23
а=-41
56+(х+а)=28
56+(х+5)=28
х=56-28
Х= 23