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=5a-3b-2-4-2a-6b
=5a-2a-3b-6b-2-4
=3a-9b-6
5a+3b-2-(4-2a-6b)
5a+3b-2-4+2a+6b
5a+2a+3b+6b-2-4
7a+9b-6