x^2(x+1)
    5x^2-4.5x-7.2=0
    91*7666.66+5*7666.66*X=10000000
    16b^4-200b^3+833b^2-1384b+784=0
    X(X+2)=80
    2x²+10x-9=0
    2x²+10x-9=0
    x ^ 2 －8 1 x + 243 = 0
    10.61*(1-q^9)/(1-q)=43.7
    x＾3-3x＾2-3x-1＝0
    4x²－600x＋30000
    x²-2x=7
    x
    x（x-2）=7
    6-12/5x=3/2-3/10x
    6-12/5x=3/2-3/10x
    0.3x-0.4/0.2+2=0.5x-0.2/0.3
    1/3（x+7）=2/5-1/2(x-5)
    2x+（3x-20）=5
    (x-45)²＋150*150＝x*x

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