3x-3 (8-9x)

3 (9m-7)

2-2z+6-5z

3(11a+12f-2f)

3x-3(8-9x) = 3x-24+27x = 3x+27x-24 =30x-24 = 3(10x-8)

3(9m-7) = 27m-21

2-2z+6-5z = 2+6-2z+5z= 8+3z

3(11a+12f-2f) = 33a+36f-6f = 33a-30f

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