(2a-3b)*(2b+3a) How much is it,
Let's take (2B + 3a) as a whole, so that
Original formula = 2A * (2B + 3a) - 3B * (2B + 3a)
=2a*2b+2a*3a-3b*2b-3b*3a
=6aa-5ab-6bb
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