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2. (5x+7) - 3(2x+5)= 5x+7 - 6x-15= -x-8
3. 8x- 2(-4x+7) = 8x+8x-14=16x-14
4. -3(2x-5)+ 2(-x+4)= -6x+15-2x+8= -8x+23
5. 2x²-3x+5 - 3x²+x-9= -x²-2x-4