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2x - 5 < 7
2x < 7 + 5
2x < 12
x < 6
x = 5, 4, 3, ...
F.
-8 + 5x >= 3x
5x - 3x >= 8
2x >= 8
x >= 4
x = 4, 5, 6, ...
G.
x + 2 < 2x + 1
2-1 < 2x - x
1 < x
x > 1
x = 2, 3, 4 ...