2x+3>1
    2^x>1.37
    k+10-6000k^2/(90k-10)>0
    x^2-9x-36>0
    x^2-2x+8<2x^4
    (4^x-2^(x+1)+8)/2^(1+x)<8^x
    4^x-2^(x+1)+8<2*2^4x
    a-a*lna-1>0
    -(x-4)^2+4>=0
    x>750*x^-0.125-23.48*x^5/12
    x>x^-0.125-x^5/12
    2x^2+3x+1>0
    4x^2+6x+3>-1
    1/6>√x
    1/6>x^(1/2)
    1>6x^(1/2)
    (4x+2)/(3x-7)>3
    5x^2+x>=15x+3
    200*(5x+1-3/x)>=3000
    -1a+sqrt(a*a-1)

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