Mathematics
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    2.5n<18+(n-1)5
    6n<18+(n-1)9
    3n<18+(n-1)6
    3n<18+(n-1)9
    2.5n<18+(n-1)6
    2n<18+(n-1)5
    2n<18+(n-1)6
    4*k-4/3>4*k*k-2*k+13/3
    -4*k*k+4*k-7/3>0
    22>-2*k+13/3
    50+0.95(X-50)>100+0.9(X-100)
     x-3<5 x−3<5
    −4x>4
     3x-1≦11 3x−1≦11
    −x+2≤3
    x+9>17 x+9>17
    3x−1≤5
    9−2x<3
    x-7>-3
    3x>- 6

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