X^2+250X-4500000=0
    5/14x=1/7
    9x-3.8x=18.72
    （1＋x）∧10＝1.6689
    5/14x=1/7
    （1＋x）＾10＝1.66897
    xx+860x-48000
    x×0.97=14623.09
    25X+（x-200）*25=15000
    y=1000+0.75（y-600）+800+750
    14821=1.56×10^-4×x^0.58
    a^3+3a^2+30a-90=0
    -0.1x²+2.6x+43=59
    -x²+26x+160=0
    x/(x+2155.72)=0.51
    96000/x=168000/（2x-400）
    96000/x=168000/2x-400
    4x^2=4x^4+1
    -sinx＋1/2＝0
    -sinx＋1/2＝0

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