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1) 6x-6y-6x+12y+5
6y+5
2) 6(m²-m+2)-3(2m²-5m+1)
Factorizando el 3
3(2(m²-m+2)-(2m²-5m+1))
3(2m²-2m+4-2m²+5m-1)
3(3m+3)
Factorizando el 3
9(m+1)
3) 7-y+6x-15y-7x
7-16y-x