Упростите выражение:

1)(х-4)²-16
2)10а+(а-5)²
3)(3m-7n)²-(3m-7n)²
4)b(b-3)-(b-4)²
5)(12a-b)2-(9a-b)(16a+2b)
6)x(2x-9)²-2x(15+x)²
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