(ab+2ac-3cd-5de) - (-4ac+8ab-5cd+5de)
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(ab+2ac-3cd-5de) - (-4ac+8ab-5cd+5de)
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(ab+2ac-3cd-5de) - (4ac-8ab+5cd+5de)
= ab+-8ab+2ac+4ac-3cd+5cd-5de+5de
= -7ab+6ac+2cd-0
= -7ab+6ac+2cd is your answer
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