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2x-7≥0
2x≥7 I: 2
x≥ 7/2
x≥ 3 1/2
x ∈ < 3 1/2 ; +∞ )
D = < 3 1/2 ; +∞ )
2x-7≥0
2x≥7
x≥7/2
D=<7/2, +∞)