x+3/5<2x-4/3+1
    5x+1≤3x-1
    50x+40(40-x)≤2295
    2x－140=2628900
    3-(x-1)/4>=2+3(x+1)/8
    2+7a>9
    -3a+5≥0
    x/2+x/3≤5
    4-3x>=2x-6
    3x-4>=4+2(x-2)
    -1.5x+3<0
    3x+2<2x+3
    180x＋240(20-x)≤4320
    20-x≥x
    4(x＋1)≤7x＋10
    x-5<(x-7)/3
    x-5
    5x+1>3(3x-1) 0.5x-1≤7-1.5x
    x-5
    (x-1)/5 <(2x+5)/3

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