x/70=x/60-5
    (x-800)x(1-20)+800=1760
    x^x×1/x
    xx×1/x
    x+2
    x^2-36x-144=0
    A*0.64*1.24=A-10
    x^3-5*x^2+24^x-16=0
    0.9*x=2.54
    sinx=1
    sinx=1
    ln x-1
    2lnx-8x+2＝0
    lnx-4x+1＝0
    lnx-4x+1＝9
    8*x^4-8*x^2+1=0
    1^x=2
    ((X-1.18)/1.18)/0.33=0.23
    0.91*x*1.15=4.03
    arctanx=3

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