October 2018 1 55 Report
1.- (a+b) +(a-b)
2.-(a+b) + (b-a)
3.-(a-b) + (a+b)
4.-2a-(2a-3b)-b
5.-3x+2y-[x-(x-y)]
6.-2m-3n-(-2m+n-(m-n))

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