55ab(3a-18)(2a-6)÷22b(a-6)
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55ab(3a-18)(2a-6)/22b(a-6)=
55*3*2ab(a-6)(a-3)/22b(a-6)=
15(a-3)
55*3*2ab(a-6)(a-3)/22b(a-6)=
15(a-3)
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