(-ab+5a-4)-(4a-ab+9)
ad+5a-4
4a-ab+9
________
4a-5a-5
=4+5-5
=9-5
=4
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(-ab+5a-4)-(4a-ab+9)
ad+5a-4
4a-ab+9
________
4a-5a-5
=4+5-5
=9-5
=4