48x²-576x+35643＝0
    (870+x)÷50=(1310+x)÷70
    ln(1-3*x/0.01925)+3*x/(0.01925)=-(x^2/0.01925)
    ln(1+x)-x=-7.72
    (870+x)÷50=(1310+x)÷70
    (870+x)÷50=(1310+x)÷7
    ln(1+3*x/0.01925)-3*x/(0.01925)=-(x*x/0.01925)
    ln(1+3*x/0.01925)-3*x/(0.01925)=-(x*x/0.01925)
    ln(1+3*x/0.01925)-3*x/(0.01925)=-(x*x/0.01925)
    ln(1+3*x/(0.01925))-3*x/(0.01925)=-(x^2/0.01925)
    ln(1+3*x/(0.01925)-3*x/(0.01925)=-(x^2/0.01925)
    ln(1+(3*x/(0.01925))-3*x/(0.01925)=-(x^2/0.01925)
    ln(1+(3*x/(0.01925))-3*x/(0.01925)=-(x/0.01925)
    ln(1+(3/(0.01925/x)))-3/(0.01925/x)=-(x/0.01925)
    ln(1+x)-x=-2.992
    （X-40）×（1-20%）÷700=（X-40-48）×(1-20%)÷600
    ln(1+x)-x=-2.992
    (23-x)*(500+2*x）=8400
    0.5926x-0.0684sin(2πx)-0.068=0.2122(sin(πx))^3+0.0623sin(πx)+0.0623sin(1.25π-2πx)
    x2021=x2019

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