\(a.2a+4b+\left(-4b+5a\right)-\left(6a-9b\right)\)
\(=2a+4b-4b+5a-6a+9b\)
\(=\left(2a+5a-6a\right)+\left(4b-4b+9b\right)\)
\(=a+9b\)
\(b.6a\left[b+3a-\left(4a-b\right)\right]\)
\(=6a\left[b+3a-4a+b\right]\)
\(=6a\left[4a-a+b+b\right]\)
\(=6a\left(3a-2b\right)\)
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