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