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x + 8 - 3x + 7
- 2x + 15
8. (3x-2)(2x+4)
6x²+12x-4x-8
6x²+8x-8
9. (a+b)²-(a-b)²
(a²+2ab+b²)-(a²-2ab+b²)
a²+2ab+b²-a²+2ab-b²
4ab
10. 9x²-y²
(3x+y)(3x-y)
11. x²-3x-18
(x-6)(x+3)
12. 3x²+16x+20
(3x+10)(x+2)