x-10＜7x+2
    x+2<8*x
    x+2<8*x
    3*(x+1)<=x+7 x>-1
    3*(x+1)<=x+7;x>-1
    3*(x+1)<=x+7
    2<3x<4
    2<2x<4
    20x-x^2>42
    1<2x<4
    24-3X+3≥4X+6
    X-9X+2≥4
     15<23x <17
    16.254×n×n+5.526×n×n×n-2035.24-396.734×n≥0
    16.254n2+5.526n3-2035.24-396.734n≥0
    5/（X+3）≥1
    0.4^n≤0.01
    0.4*n≤0.01
    2x-4<4-3+x
    x1+x2+x3+x4<=11000 x1/(x1+x2+x3+x4)<=0.65

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