1.

2. Subtract:(i) - 8xy from 7xy(ii) (a2 + b2-2ab) from (a2 + b2 + 2ab)(ii) (x-y-7z) from (2x -9y + 2z)2ab) from (a +b+2a312-7m) from (712 +2,11iv)/m from+m(iv)

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