Subtract.
I) 6xy from-12xy
ii) (a-b) from (a+b)
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1) 6xʏ ғʀᴏᴍ -12xʏ
➸-12xʏ-6xʏ
- ᴀɴs= -18xʏ
2) (ᴀ-ʙ) ғʀᴏᴍ (ᴀ+ʙ)
➸(ᴀ+ʙ)- (ᴀ-ʙ)
➸ᴀ+ʙ-ᴀ+ʙ
➸ᴀ-ᴀ+ʙ+ʙ
- ᴀɴs= 2ʙ
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