Mathematics
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    x[30-2(x-15)]≥400
    (6-x)(8-x)≤24
    x÷x+3≥0
    3÷x-5≥0
    x∧2-25x-200≤0
    -1-2x/x-3≥-1
     x < sin [( π * x) / 4 ] + 1 / 6
     x < sin [( π * x )/ 4 ] - 1 / 6
     x < sin ( π * x / 4 ) + 1 / 6
     x < sin[ ( π * x) / 4 ] - 1 / 6
    x
    
3x+2≥0
    x+1÷x—2≥0
    1÷2x+1≥0
    x(1-2x)≤0
    x(1-2x)≤0
    -1+a
    
3a-a
    
x(1-2x)≤0
    (2k+1)^2-4(k^2-1)≥0

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