ex＝1.31
    22x+30（1/2x+15）=6000
    x^2-12x-60=0
    5/3x8=5/22
    6/5x=32/5
    6/5x=3/5
    x5/3=20
    x÷34=2.7
    x÷34=27
    9/5x=10
    9/5x=10
    0.5x=6.3
    6X=126
    x÷1.8=18
    x/(1-(1-x)^200)=0.00925
    x/(1-(1-x)^280)=0.00763
    x/(1-(1-x)^380)=0.00452
    x/(1-(1-x)^80)=0.0263
    x*(1-(1-x)^80)=0.0263
     xlnx-18.46x+4883.8=0

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