X-0.173X-(X-5000-0.173X)*0.03=5000
    X-0.173X-(X-5000-0.173X)*0.03=5000
    X-0.173X-(X-5000-0.173X)*0.03=5000
    X-0.173X-(X-5000-0.173X)*0.03=5000
    X-0.173X-(X-5000-0.173X)*0.03=5000
    V=437.75+80.00+20.71+0.01V+21.21+0.0002V+33.58+0.0006V+0.0538V
    2x×x×x-x×x
    -3x^2+x+1
    （7424+x）÷5＝1804
    （7424+x）÷5＝1804
    x4十4x＋3
    300* x/455＝
    455* x＝300*x
    (1.5+2x)(1+2x)=3
    2x²-50x+300
    （50/x+6.8）*0.493=(40/x+8.5)*0.507
    2∧x=32x
    27=21+4X
    27=21+4X
    27=21+4X

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