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
    (x-45)²＋150＝x*x
    50x-x²=336
    (3-x)^2=2x
    (3-x)^2=1
    4x^3+21x^2+20x=0
    8x^2+51x-27=0
    100/96=X/18
    25/24=x/9
    x^3+ln(x)-2 = 0
    x^3+ln(x)-1=0
    -x^2-10x-16=0
    x^3+3x^2+2x=0

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