Factorize : a 3 - b 3 + 1 + 3ab
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3a-3b+1+3ab
=3a-3b+3ab+1
=3a(-3b+3ab)+1
=3a+ab+1
=3ab+1
=3a-3b+3ab+1
=3a(-3b+3ab)+1
=3a+ab+1
=3ab+1
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