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                                    Subtract the sum of 12ab−10b2−18a2 and 9ab+12b2+14a2 from the sum of ab+2b2 and 3b2−a2. | 
                            
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Answer»  Subtract the sum of 12ab−10b2−18a2 and 9ab+12b2+14a2 from the sum of ab+2b2 and 3b2−a2.  | 
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