ln（3x+1）＝2
    x*x+35x=200
    60*x+(190-60*x)=190
    (2x-1)(3-x)=0
    x^2+4x-0.001=0
    x^2+4x+0.001=0
    x=x
    sqrt(i)
    -x^2+3x+10=0
    ㏑666.6-㏑(666.6-p)=0.0386×(933.3-p)×36000÷1000÷8.314÷600
    ㏑(666.6)-㏑(666.6-p) = 0.0002786p
    ㏑(666.6÷666.6-p)=0.0002786p
    ㏑x=6.5-1.39(666.6-x)
    ㏑x=-920.074+1.39x
    5.46×(4.859+t)^2*（2.039+2/3*t）-18.61*t^2*(3.659+2/3*t)=0
    1.16x^2+1.16x-0.32=0
    （200-1100）/（1+（3/4））=x
    (x-1)(2-x)(x-5)
    1/d+1/(d+1)+1/(d+3)=1/(d+2)
    2*q∧3+7*q∧2+7*q-2＝0

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