x^2-11/2*x+5/2=0
    x²-10x-112=0
    393-22x=85
    393-22x=85
    x+x*0.01=400
    x:120=36:48
    x^23+456=41255
    (X-700)-700*0.037/12*2-(X+700)*3/10000-(X-700)*0.13*0.12=0
    2/5x+1/3（100-x）=36
    1/3（170-x）-1/4x=10
    1/2:1/4=1/6:x
    32=（（0.021*x^1.85+557）^0.5）*x^0.84
    171=（（0.021*x^1.85+557）^0.5）*x^0.84
    280-144x+16x^2=216
    X/1.01*0.01+（1348246.89-X)/1.13*0.13=70404.08
    (X-700)-(X+700)*3/10000-(X-700)*0.13*0.12=0
    32.195=（（0.021*x^1.85+2389）^0.5）*x^0.84
    171=（（0.021*x^1.85+2389）^0.5）*x^0.84
    (1+x)^4=1.39
    36-5x=62-21x

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