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2) (5x + 7) - 3 (2x - 5) = 5x + 7 -6x+15 = -x+22
3) 8x -2 (-4x + 7) = -32x²+56x+8x-14 = -32x²+64x-14
4) -3 (2x - 5) + 2 (-x+4)
= (-6x+15)+(-2x+8)
= -8x+23