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2. (5x+3) - (x-1) = 5x+3-x+1 = 4x+4
3. (4y-8) - (2y+15z) = 4y-8-2y-15z = 2y - 15z - 8
4. (5z+3) - (2z-7) = 5z+3-2z+7 = 3z+10
5. (6x+4) - (x-y) = 6x+4-x+y = 5x+y+4