factorise a*3-a*2b+1/3ab*2-1/27b*3
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a*3-a*2b+1/3ab*2-1/27b*3
=3a-2ab+2/3ab-3/27b
a(3-2b)+b(2/3a-3/27)
=3a-2ab+2/3ab-3/27b
a(3-2b)+b(2/3a-3/27)
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