9a (3a-5b)-12a×a (3a-5b)
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=>9a (3a-5b)-12axa (3a-5b)
here you see (3a-5b) is in both term so take it common
now
=>(3a-5b){9a-12axa}
=>(3a-5b) 3a (3-4a)
=> 3a (3a-5b)(3-4a)
here you see (3a-5b) is in both term so take it common
now
=>(3a-5b){9a-12axa}
=>(3a-5b) 3a (3-4a)
=> 3a (3a-5b)(3-4a)
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