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Algebraic problems in junior one mathematics
Analysis: find a first, then substitute it.

A+(a？ +2bc-5b？ )=3a？ -2bc+7b？ ,

So A=2a? -4bc+ 12b？

Replace it with a.

A-(a？ +2bc-5b？ )

=2a？ -4bc+ 12b？ -(a? +2bc-5b？ )

=a？ -6bc+ 17b？

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