3ab + 5bc - 7ca from 5ab - 2bc-2bc - 2 ca+10abc
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if the question is
subtract 3ab + 5bc - 7ca from 5ab - 2bc-2bc - 2 ca+10abc
= 5ab - 2bc-2bc - 2 ca+10abc-(3ab + 5bc - 7ca)
= 5ab - 2bc-2bc - 2 ca+10abc-3ab - 5bc + 7ca)
= 2ab - 9bc + 5ca + 10abc
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