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= (24x-12) - (20x-25)
= 24x-20x - (12-25)
= 4x - (12-25)
= 4x - (-13)
= 4x + 13
2. 5(-x+2) + 4(3x-4)
= (-5x+10) + (12x-16)
= -5x+12x + 10+(-16)
= -5x+12x + (10-16)
= 7x + (-6)
= 7x - 6