x^3+6x^2+x=10
    -0.5x²+20x-50
    x*x/(0.01-x)=6.166*10^(-8)
    2x^3+11x^2+20x+8=0
    x*x/(0.01-x)=6.166*10^(-7)
    120x+(1－40%)×(500－x)－40000＝20％×40000
    x/（55-x）=0.1
    2x²+x-1=0
    x²-6x+8=0
    s＾2+s+1=0
    (1+90/100)X=505875
    3x＾2－6x＋6＝0
    (90/100)X=505875
    0.9X=505875
    2200+0.05x=x
    0.79*0.77*2.46*x=3.55
    0.04×19.8÷5.8÷7.1 = （0.0625+x）ln(1+(x÷0.0625））
    0.04×14.8÷5.8÷7.1 = （0.0625+x）ln(1+(x÷0.0625））
    x+12+2/3x*1.2=66
    x*0.61*3.11*3.11=2.35

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