Subtract 8a2+5b2-6c2+7 from 3a2-4b2-5c2-6
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8a2+5b2-6c2+7-(3a2-4b2-6c2-6)
8a2+5b2-6c2+7-3a2+4b2+6c2+6
8a2-3a2+5b2+4b2-6c2+6c2+7+6
5a2+b2+13
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