4x^3+3x-2=0
    2x-8+（2-3x）=0
    2x-8+（-2+3x）=0
    2x-8+（-2+3x）=0
    100= (1+x) + (1+x)^2 + (1+x)^3 + (1+x)^4 + (1+x)^5
    x/20+x/30+x/42＝3
    cos（cosx）=cosx
    cos（cosx）=cosx
    cos（cosx）=cosx
    160=0.925*(160+x)
    1+lnx
    （x-4896）*0.3=200
    V=466.66+110.00+23.07+0.01V+23.16+0.0002V+124.58+0.0020V+0.0529V
    8-2t=4+t
    10cosx-10cosx(cosx+sqrt((cosx)^2+2sinx+11/5))=10
    441x+420（50-x）=20970
    ln2x-x+2=0
    x-2=ln2x
    441x+420（50-x）=20970
    50*sin(x)/sin(36)=20/sin(x+36)

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