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75(2a-b+1)²-12(a+b)²]
=3[ { 25(2a-b+1)²} - {4(a+b)²}]
=3[{5(2a-b+1) } - {2( a+b)}²]
=3[(10a-5b+5+2a+2b) (10a-5b+5-2a-2b)]
=3[(12a-3b+5) (8a-7b+5)]
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