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6. a) 3-(x-2) = 4; d) 4-(x-1)=2x+20; b) 2x-(x+2) = 0; e) 8x = 14-2(1-x); 1+2(x-1)=4+ 3(x-2). c) 5x-3(2x-1) = 8; f) 2x-(x-3)=5x-3(x+1)​