Mathematics
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    260(130-m)+1500m≤58600
    80m+30(30-m)≤1700
    80m+30(30-m)≥1700
    5(x+1)-3x>x+3
    4-0.5≤2x+1<4+0.5
    16X^2-200X+625=0
    10-x≤7
    10x+10(10-x)≥100
    10x+10(10-x)≥80
    12x+7(10-x)≥80
    2x-1>1-x-1÷2
    4x-2>1-x-1÷2
    x x+15>2(x-3)
    (2-7*x)*(x+4)>0
    7.5a+6(20-a)≤135 7.5a+6(20-a)≥129
    4x+9(300-x)≥1795
    15x+30(300-x)≤6300
    x-1.5(2x-1)≥4
    (X/24 )x1.2x(24x4)+(X/24)x(1.5X6x10)+X=8000
    2x+1/3>x-1 x-3(x-2)>=4

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