e^2x-2e^x-1=0
    2x➕40＝3x-160
    X*0.03=X-2900
    5^x
    X*0.03=X-25
    x-0.54x=1.38
    cot7
    cot1
    3.4x+x=26.4
    2k×k×k-k×k-12k-1＝0
    3.4*x+x=26.4
    (2x-1)(30x+7)(3x+4)^2
    2X^3+17X^2+44X+32＝0
    （X-10）×（600+200 x）=8400
    （X+10）×（600-20 x）=8400
    X*（600-20x）=8400
    0.03x+97/102x=200
    x（45.59+x）=1100
    5x+9=29
    1000*x*(1－5%)=(190*1000+950000）*(1+20%)

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