January 2019 0 14 Report
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1. (a+b)-(2a-b)-(a-2b)=
2.(3x-y+1)-(x+y)+(y-x)=
3. - (kx+ny) - (3kx+2ny) + (5kx-3ny)=
4.(2 ab +a+3) - (3 ab -a +3)=

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