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se simplifican términos semejantes
3x-5x=-2x
-2y+y=-y
a-3a=-2a
se ordenan resultados
= -2x-y-2a
3m-2n+1-m+n-3
3m-m=2m
-2n+n=-n
1-3=-2
= m-n-2
-2a+3b-4+3a-b+1
-2a+3a=a
3b-b=2b
-4+1=1
= a+2b+1
espero te sirva