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3x-5x-2y+y+a-3a
-2x-y-2a
b)3m-2n+1-m+n-3
3m-m-2n+n+1-3
2m-n-2
c)-2a+3b-4+3a-b+1
-2a+3a+3b-b-4+1
a+2b-3