0=1000x-1000x+600000
    0=Xx1000-1000xX+600000
    0=2000x-1000x+600000
    1/2x+6=2/3（x+6）
    2.36/(1+R)+(2.9854/R+2.714)/(1+R)^2=30
    x+0.15*x²=2.1571
    x+0.15*x²=2.1571
    10000×p-10000×p=24000000
    10000×p-10000×p=24000000
    （10000×p-10000×p×5%-1000000）÷1000000=20%
    （10000×p-10000×p×5%-1000000）÷1000000=20%
    2x^3-3x^2-1=0
    -3/x+1
    3x+3
    sin（arctanx）
    2m(m-4)=18
    x/2+6=（x+6）2/3
    π*(194^2-74^2)=X*4*0.042
    X-26=X/3
    10×x=100

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