Simplify = ( 2a-3b)^2 - (2a+3b^2)
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( 2a - 3b )^2 - ( 2a + 3b^2 )
( 4a^2 + 9b^2 - 12ab ) - ( 2a + 3b^2 )
4a^2 + 9b^2 - 12ab - 2a - 3b^2
4a^2 - 2a + 6b^2 - 12ab
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