x*(1-7%)=812650.47
    X/87-(95-X)/1000=0.21
    87/X-(95-X)/1000=0.21
    32.69*（1-x^16）/（1-x）=2564.7
    2a=3/2a-a
    x^3+2*x^2+x+0.5=0
    4x^4+x^2-62.8 = 0
    4x^4+x^2-25/2.512 = 0
    4x^4+x^2-25=0
    0.01x^4+x^2-10000=0
    0.01x^4+x^2-100=0
    3.94*（1-x^10）/（1-x）=89.92
    90-x
    198.7*（1-x^6）/（1-x）=1635
    √x-3x
    x/x+336=0.266
    X+X÷11.3=100000
    ax^2=2
    —x²+4x+5
    45-x=2[39-(x-1)]

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