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(3m+8n)+(4m-2n)-2 aqui destruyo parentesis y reuno terminos semejantes y los sumo o resto segun los signos:
3m+8n+4m-2n-2= (3m+4m)+(8n-2n)-2=7m+6n-2
(3m+n+ñ+p)-(4m+3n+8p)=
3m+n+ñ+p -4m-3n-8p = -m-2n-7p+ñ