sumar= 3m-2n+4 , 6n+4p-5 , 8n-6 , m-n-4p
3m+m
-2n+6n+8n-n
4p -4p
4 -5 -6
4m+11n-7
3m-2n+4+6n+4p-5+8n-6+m-n-4p
3m+m-2n+6n+8n-n+4p-4p+4-5-6
4m-11n-7
