2a>a+6666
    2a>a+5
    2a-a>3
    2a-a-3>0
    2a+a>3
    2a+a-3>0
    2a+a+3>0
    2a-a+3>0
    4a-a-8>0
    4a-a>8
    4a-a+8<0
    4a-a+8>0
    4a>a+8
    2a>a+3
    118a+76(20-a)≤1910
    3x+4[x]=16
    20-a≤2a
    1+a≥lna
    a2+4a+2=7
    1/x<1

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