Ответ:
5m+21+8m-6n+m-19=14m-6n+2
5m+21+8m-6n+m=5m+2+8m+6n+m=14m+2-6n=14m-6n+2
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Ответ:
5m+21+8m-6n+m-19=14m-6n+2
5m+21+8m-6n+m=5m+2+8m+6n+m=14m+2-6n=14m-6n+2