x-15000-x*8%/4-4500=0
    (3-x)^2+(0.5x+1.5)^2+18=x^2+(0.5x+4.5)^2
    x*8%/4=6000
    x-1500-x*8%/4-4500=0
    x-1500-x*0.08/4-4500=0
    x-1500-x*8%/4-4500=0
    24x-x^2=0
    21+21/(1+x)+21/(1+x)^2+21/(1+x)^3+21/(1+x)^4+21/(1+x)^5=200/(1+x)^20
    21+21/(1+x)+21/(1+x)^2+21/(1+x)^3+21/(1+x)^4+21/(1+x)^5=200/(1+x)^19
    21+21/(1+x)+21/(1+x)^2+21/(1+x)^3+21/(1+x)^4+21/(1+x)^5=226/(1+x)^24
    21+21/(1+x)+21/(1+x)^2+21/(1+x)^3+21/(1+x)^4+21/(1+x)^5=200/(1+x)^19
    21+21/(1+x)^2=200/(1+x)^19
    24x^2-118x+58=0
    24x^2-118x+58=0
    x＝π/3
    n²+n＝4050
    500x+1/30/1-1/60x×700＝2400
    （x-40）×0.25=0.32x-24
    1/2(2-x)^2
    70(t-1)＝60t

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