2.25-5x+xx=0
    sinx-2.383x+1.152π=0
    b^4+6b^3-41b^2-150b-225=0
    2x^2-13x+21=0
    4x^2+17x-21=0
    x^2-50x+600=0
    a^2-118a+3040=0
    sinx-2.673x+1.394π=0
    （32-1.5a）^2=4a
    sinx-2.59x+1.325π=0
    sinx-1.295x+0.6625π=0
    sinx-1.295x-0.6625π=0
    0.256sinx-x+0.512×3.14=0
    (10-x*x)*8=-6*(8-x*x)
    x-1/x
    80x+56（50-x）=2880
    x（1-sin(2πx)/2πx）+(3x-1.25)=0
    x（1-sin(360x)/2πx）+（3x-1.25）0.196=0
    x-x/1.09*0.03=1007225.61
    x-x/1.09*0.03=4061460.81

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