4x-15=6x-90
    log(1+e^x)
    4x-15=6x-90
    3.2+x＝8.8
    x÷7＝0.42
    x^2+2x=2
    x^2+2x=1
    x^2+x=8
    x^2+x=4
    x^2+x=1
    x^2+x=240
    x^2+6x=240
    x^2+3x=240
    x^2+4x=240
    x^2+2x=240
    x/5%=500
    x^5%=500
    (300-4/3m)*(1+2.5m%)=300*(1+m%)
    x×lnx
    9x²+150x+275

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