（1-x）^3 = 0.9
    （1+x）^3 = 0.9
    x²-110x+2000
    -2x²+220x-4800=800
    x^2+40x=1110
    -3.25x^2/(46-4.25x)=33.43
    1.2x-35x1.2=8.4
    4*3-4*2x=4x+12
     X+X÷9=X+3+（X+3）÷24
    10/(1+x)+10/(1+x)^2+10/(1+x)^3+110/(1+x)^4=102
    10x=X+3+（X+3）÷24
    1194497000＝13.8×1100×x×（980-x/2）
    10x=X+3+（X+3）*24
    6/x-8/x=2
    82+4.5x=100
    2.98x²-1.596x+0.0198＝0
    8x²+2/x+5
    8x²+5/2X+2
    0.25x^6+1.25x^4+x^2-25=0
    x^2-2.42x+1.092

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