Factorise 30ab - 12a + 10b - 4
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= 30 ab - 12 a + 10 b - 4
= (30 ab - 12 a) +( 10 b - 4)
= 3a (10 b - 4)+ 1 ( 10 b - 4)
=( 3a +1 ) ( 10 b - 4)
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