x:(5.4-x)=5:4
    x/4-2=16
    x%4-2=16
    48-x/x = x / 48
    48-x/48 = x * x / 1
    3y=2(y-1)+1
    30-2x=（30-3x）*4
    -(1-x)*(1-x)*lnX=1
    40-3x=4
    3498.19*tan(20/180)/0.977777777777
    tan(20/360)/0.977777777777
    1+2(x+ 3) = 4 + 4(x - 6) - 7
    x^2-3.74x+0.01916=0
    19.2^0.103=1.624-0.0041k
    arccos(0.9777777777)
    x^(2)+x-1=0
    x^2-374x+0.01916<=0
    cos(-0.606091)-sin(-0.606091)+sin(-0.606091)cos(-0.606091)
    arccos0.9777777777
    x^2-374x+0.01916=0

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