Question: In Problems 9-30, perform the indicated operations and simplify. 12. 2y - 3y[4 - 2(y - 1)] 28. (a + b)(a2 - ab + b2)

In Problems 9-30, perform the indicated operations and simplify.
12. 2y - 3y[4 - 2(y - 1)]
28. (a + b)(a2 - ab + b2)
30. [a - (2b - c)][a + (2b - c)]

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