tanx=1.25
    tanx=1/0.8
    3a²＋2a＝1
    80 x=16 x+960
    4xx＝144
    x=1/6+1/12+1/7+1/2x+4
    x（x-2024）=-2023
    ln(8.64/x)=5.40
    ln8.64/x=5.40
    ln（x/8. 64）=5.40
    211*x/24+4.4x=305823.17
    ln（8.64/x）=5.40
    e^x=10001
    e^x=101
    30x²-61773811.2x-1172266905.6=0
    4+【（18-10x/544）/91.62】*0.03=（2.1/x/1600-120）*0.07
    e^x=5001
    4+（18-80x/544）/2.7486=（2.1/x/1600-120）*0.07
    e^x = 2001
    e^x = 1001

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