Mathematics
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    (5a-3(6-a)/5)/2-(6-a)/5>0
    (100-x)÷x≤0.05
    x÷(100-x)≤0.05
    (x +1)(x +2)>0
    5x^2-14x-3≥0
    -3x+5x+28≥0
    3x²-5x-48≤0
    -3x²+5x+48≥0
    x+2>2
    18-2x²<0
    18-2x<0
    -3x²+5x+28≥0
    -4x²+4x-2<0
    4x²-4x+2>0
    -4x²+4x+2<0
    -408-45+300+X-X*10%/4大于或等于30
    -408-45+300+X-X*10%/4大于或等于30
    -408-45+300+X-X*10%/4大于或等于30
    16x²+24x+9≤0
    -x²+2x-1≤0

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