ab+2ac-3cd-5de-(-4ac+8ab-5cd-5de)
ab+2ac-3cd-5de +4ac-8ab+5cd+5de
-7ab+6ac+2cd
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ab+2ac-3cd-5de-(-4ac+8ab-5cd-5de)
ab+2ac-3cd-5de +4ac-8ab+5cd+5de
-7ab+6ac+2cd