x=6*1.1283/ln11
    x*ln(x)-(x-1)ln(x-1)=ln11/6
    x=6/ln(11)
    x*ln(x)-(x-1)ln(x-1)=6/ln(11)
    x*ln(x)-(x-1)ln(x-1)=6/ln11
    x(33一x)+20x=150
    x=2*1.104828/ln2
    x^2+26=sqrt(2x^2-20*x+67)+10*x
    x*ln(x)-(x-1)*ln(x-1)=ln2/2
    4 X2-70x+124=0
    x²+2x
    0.58*n^18+n^17+n^16+n^15+n^14=5
    6x^2-28x-49=0
    (20+x)(200-4x) = 4800
    (20-x)(200-4x)=4800
    -2*3=x
    x∧2+8x+13=0
    13.8×200x(460-x/2)=145000000
    5×[(1.5x—30)×0.8—x]=( 1.5x—x) +130
    5x [(1.5x—30) x0.8—x]=( 1.5x—x) +130

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