invx＝0.5
    2m＋1=3
    9^x=8^x+1
    9^x 8^x+1
    （1500-x）*0.0275=1.9x/30/12
    （x+1）+1/（x+1）
    (1.01)^144*x=e^x^2
    x^2-145x+1000=0
    80x=200
    -450+X-690-X*8%/4=500
    89=x^3-7x^2-x
    89=x^3-7x^2-x
    120+450X=100+500X
    120+480X=100+500X
    x+ln(x)+1/x=5
    x+ln(x)+1/x=5
    10-2p-2+2p
    100=0.45X+50
    (x+sqrt(x^2-20))/2=0
    100=50%X+5%(1000-X)

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