-3xy-x+1=1-(______) a-(b+c-d)=a-b-(_______)

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-3xy-x+1=1-(______) a-(b+c-d)=a-b-(_______)

-3xy-x+1=1-(______) a-(b+c-d)=a-b-(_______)
-3xy-x+1=1-(______) a-(b+c-d)=a-b-(_______)

-3xy-x+1=1-(______) a-(b+c-d)=a-b-(_______)
1-(3xy+x)
a-b-(c-d)

-3xy-x+1=1-(x+3xy)
a-(b+c-d)=a-b-(c-d)