November 2018 1 16 Report
1)7a-9b+6a-4b
2) a+b-c-b-c+2c-a
3)5x-11y-9+20x-1-y
4)-6m+8n+5-m-n-6m-11
5) -a+b+2b-2c+3a+2c-3b
6) -81x+19y-30z+6y+80x+x-25y

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