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1. (3x + 5) + (3 - 4x )
2. (5x + 6x + 9x - 2 ) + ( 7x- 9x2 + 9x)
3. (-23m + 18n)-(2m - 13n)
4. (x-6)(x-8)
5. (12-23c? + 160-4)=(3-2)​