-1/9x^2+4／3x＝1
    10^(x-1)=362880*x
    1.56-2 x=0.94
    1.12a=175
    4x^2-4x-3=0
    4x－4x－3＝0
    4x－4x－3＝0
    0.9*9.81x-0.9*11.171*e^((-10/9)x)+0.9*11.171=959.6190864
    （x+0.5）^2=99.75
    （x-2)/5-(x-4)/3＝1
    （x2+0.5）=99.75
    (x-1)/2＝4/3x+1
    (x-1)/2＝4/3+1
    (x-1)%2＝4%3+1
    3*9.818(1-e^((-1/3)x))=20
    x^2-55x+736
    x^2-55x+800=0
    2^x=4x
    0.981x+0.0981*e^(-10x)-0.0981=2000
    0.981x+0.0981*e^(-10x)-0.0981=2000

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