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5x - 4y + 3 ≤ x + y - 2
5x - x - 4y - y ≤ -3-2
-4x -5y ≤ -5
b
x + y -1 > 2x - 4y -1
x - 2x + y + 4y > -1+1
5y - x > 0
c
5 - x - 2y ≥ 6 - x - 2x
-x + x + 2x - 2y ≥ 6 - 5
2x - 2y ≥ 1
d
8x - 2y - 3 < 5 - 4x
8x + 4x - 2y < 5 + 3
12x + 2y < 8