x×(100-x)÷2=0
    100x+x×x=0
    (10-a)(15a+120)=840
    2/3a-a=2/a
    7600/(x+107*0.22)+10000/(x+107*0.1)+10000/x=150
    4*x+2*x=144
    9020+20000x=46000[(82600x-4085)/6000]
    9020+20000x=4600[(82600x-4085)/6000]
    9020+20000x=4600[(82600x-4085)/6000]
    sinx/x=0.74
    x+1/x－1
    4(3x+1)＾2-1=0
    4(3x+1)-1=0
    x（1-㏑x）²
    x=㏑1/x
    cot0.1
    x^3+5x+9=0
    x^3+x^2+5=0
    x^9=9^x
    x=1/e

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