95.238*x^2+1070.2*x+3101.9=0
    2*x^2-1=0
    95.238*x^2-1070.2*x+3101.9=0
    2.661*(37-x)=(x-15)^0.75
    1（1-x）+x*4=4(1-x)+x*2
    (x-100)/x=0.3
    6*(x+1127)/127=6*(x+123)/123
    778.32=-10^(-7)*x^2+0.055x+749.02
    174800+310x<=159800+460x
    lgx=1.0848
    15.219/x=10000
    （x40%+x30%+x30%）60%+x40%=76
    18934/x^0.6+116.67=15.219
    x^3-3x^2+2x+8 = 0
    0=13×b×b+400÷13-13-32×b×b
    x-3(x-2)>4
    lnx=-12.30344334
    16.8=2.082*x^0.4+0.01863*x
    32×b×b=13×b×b+400÷13-13
    1-2x<0

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