(x-60.41)/x=5%
    (x-35.85)/x=5%
    (x-35.84)/x=5%
    (x-57.23)/x=5%
    (x-59.32)/x=5%
    (x-58.03)/x=20%
    x÷3100+2.5x÷2600+4x÷2750+0.5x÷1000+0.01=1
    3*x+1=7
    (x-55.46)/x=20%
    2/x+1/（x＋13.2）＝1/90
    2/x+1/（x＋12.0）＝1/90
    2/x+1/（x＋12）＝1/90
    2/x＝1/90
    2/x+1/（x+12）＝1/90
    180/x+90/（x+12）＝1
    90/x+90/（x+12）＝1
    180/x+90/（x+12）＝1
    180/x+90/（x+12）＝1
    180/x+90/（x+12）＝1
    90/x+90/（x+12）＝1

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