x^4+x^3+x^2+x=0
    80*(1+x)=100
    5000=6000/（1+R）^3
    5000*（1+R）^3=6000
    5000*（1+X）^3=6000
    5000*（1+X）^3=6000
    x^2-x-8099.5=0
    √(25-X^2)-√(15-X^2)=2
    4×(x+2)=x-1
    4×(x-1)=x+2
    4×x- 1=x+2
    √t-5÷2=1/-√t
    X^2+X=6
    t-4=√(t-2)
    X-3=2√(X-3)
    2X-√(2X+1)=5
    x-x*6.5%-x*2.29%=284671.65
    x-x*6.5%=284671.65
    x-6.5x=284671.65
    X-X/1.03*0.03=980000

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