factorise by grouping 3ax-6ay-8by+4bx
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3ax - 6ay - 8by + 4bx
= 3a(x-2y) + 4b(x-2y)
= (3a+4b)(x-2y)
= 3a(x-2y) + 4b(x-2y)
= (3a+4b)(x-2y)
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