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(3x-2) - (2x-4) = x+2
(2x-1) + (1-x) = x
(2x-1) - (1-x) = 3x-2
3x + (2+1) = 3x + 3
3x - (2+1) = 3x - 1
-5x + (2x-4) = -3x - 4
-5x - (2x-4) = -7x - 4