x+1/x
    3m+3=18/(m+2)
    3m+3=18/(m-2)
    14.4x=2^(x+1)-1
    3m+3=18/(m-2)
    3m+3=18/(m+2)
    18/(x+2)-x=2
    X^2-10X+46=0
    (68-x)*(35+2x)+(100-x)*(15+x)=4240
    tanx-0.05x＝0.015
    tanx-0.05x＝0.015
    √x=-1
    （√x）^3+√x=0
    （√x）^4=1
    x^（e/x）=e
    1/a=0
    4/4—x2
    x^2+1-√（2x^2+1）=-1
    x^2+1-√（2x^2+1）=1
    x^2+1-√（2x^2+1）=200

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