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Mathematics 21 Online
OpenStudy (ny,ny):

factor -140a^2 - 84ay +12xy + 20xa

OpenStudy (anonymous):

http://www.wolframalpha.com/input/?i=+-140a^2+-+84ay+%2B12xy+%2B+20xa hope that source helps

OpenStudy (ny,ny):

need it explained though. source doesn't give any info.

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