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11+x/2≤3+4x<12+x+3/5
11+x/2≤3+4x /*2 ∧3+4x<12+x+3/5/*5
22+x≤6+8x ∧ 15+20x<60+5x+3
-7x≤-16/:(-7) ∧ 15x<48/:15
x≥16/7 ∧ x<48/15
x∈<16/7, 48/15)