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Step-by-step explanation:
1. ½(2r + 4) - ¼(16 - 8r)=3r-2
2. (8x - 3) - (2x + 6)=6x-9
3. (2 - 7y) - 3(y - 9)=-10y+29
4. 2(3x - 4) - (2x - 5)=4x-3