Mathematics
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    800x+950(60-x)≤50000
    0.9×106620000≤20.5×1830×x(950-0.5x)
    1/4-x/5<-x/7+2/7
    7x-2(x-5)≤20
    35-28x<40-20x
    12*9=36*3 67<58
    12*9=36*3 67>58
    34*56=5<6
    34*56=>
    78>56>45
    4<78>56>45
    4<78>56
    4<78
    2<8
    2^x≥1000000000000
    x+2小于x+6
    4x-3大于等于2x-5
    15x-10≤20x+25-20
    ((x+5)/2)-((x+7)/6)>1
    10x-8 ≤15x+20-20

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