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1) x(a-b)+y(b-a)
2)m^2(a-2)+n(2-a)
3)2m(x-y)-y+x
4)2n(x-y)-(y-x)
1) x(a-b)+y(b-a)
2)m^2(a-2)+n(2-a)
3)2m(x-y)-y+x
4)2n(x-y)-(y-x)
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Answers & Comments
2)m^2 (a-2)-n(a-2)=(a-2)(m^2-n)
3)2m (x-y)-(x-y)=(x-y)(2m-1)
4)2n (x-y)+(x-y)=(x-y)(2n+1)