x^3/4
    (5-x)(5-x)(2-x)-8(5-x)=0
    (5-x)(5-x)(3-x)-9(5-x)+3-x+27=0
    106.9651x＾0.464667e（0.066007-0.264028x）=20
    106.9651x＾0.464667e（0.066007-0.264028x）
    -（1/3）=（36+x^2-64）/（12x）
    x^2+4x-28=0
    (2^x-1)/(2^x+1)
    x÷（100+x）=0.1
    x+x²=96
    （x-9)/4000*9=(x-12)/2000*12
    x²2 x
    0.75=0.5+(x-30)*0.05-10*0.05
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000

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