Помогите пожалуйста *-* №1

Упростите выражение:

1.  (3a + 5)(3a - 6) +30 =


2.  8x - (3x + 1)(5x +1) =

3.  (y + 2)(y + 3) - (y² + y) =


4.  (c + 2)c + (c + 3)(c - 3) =
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