a×0.6=16.8
    1.29*（1.88+x）=x
    160+5.48x^2-4.02x-91.52-71.88-207.27
    160+233.04+6.93x^2+119.57x-91.52-71.88-207.27-116.02-80.61x-15.86x^2
    160+233.04+589.16+5.80x^2+133.25x-91.52-71.88-207.27-116.02-576.2-264.51x-17.96x^2
    160+233.04+589.16+5.80x^2+133.25x-91.52-71.88-207.27-116.02-576.2-264.51x-17.96x^2
    160+233.04+589.16+5.80x^2+133.25x-91.52-71.88-207.27-116.02-576.2-264.51x-17.96x^2
    160+233.04+589.16+5.80x^2+133.25x-91.52-71.88-207.27-116.02-576.2-264.51x-17.96x^2
    160+233.04+589.16+5.80x^2+133.25x-91.52-71.88-207.27-116.02-576.2-264.51x-17.96x^2
    4.8x²-480x+1635＝0
    160+5.48x^2-4.02x-91.52-71.88-207.27
    160+233.0+6.93x^2+119.57x-91.52-71.88-207.27--80.61x-15.86x^2
    160+233.0+6.93x^2+119.57x-91.52-71.88-207.27-116.02-80.61x-15.86x^2
    160+233.04+6.93x^2+119.57x-91.52-71.88-207.27-116.02-80.61x-15.86x^2
    160+233.04+5.54x^2+119.57x-91.52-71.88-207.27-116.02-80.61x-15.86x^2
    X-50/450-X/400=1
    160+167.07+5.48x^2+59.56x-91.52-71.88-207.27-96.32x-19.7x^2
    160+5.78x^2-4.02x-91.52-71.88-207.27
    sinx-ln(x+1)=0
    160+5.78x^2-4.02x-91.52-71.88-203.33

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