(x-180)/2400=(x-450)/2000
    (x-180)*(1-25%)/2400=(x-450)(1-25%)/2000
    3997116=X-X*12%/1.05*0.05
     (14)(x+800)+(14)(x+500)+2*9x/12+7x/12+9x/12+11x*26/12+81x =743162.33-24100
    x²+（x-2）²=（x+2）²
    xx+（x-2）x=x（x+2）
    x（x+4）=45
    X/(X+39)=0.156
    24/x-24/（x+2）=2
    24/x-24/x+2=2
    x^x＝4
    (6-6k)/(3k-1)+(6-4k)/(2k+1)=-4
    X/10+x/15+X/21=3
    ¼x+225＝⅕x+300
    x=2*x*x-8*x+8
    n²+n＝600
    n²+n＝300
    X²-8x+1
    1.05=-1/x*ln(1-x)
    1.07787227=-1/x*ln(1-x)

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