(x-20)-(x-20)/2=15
    16x^5-20x^3+5x=1
    4m^（2）+4m+1-4m^（2）-4m=25
    （2m+1）^（2）-（2m^（2）+2m）=25
    （x1+x2）^（2）-2（x1+x2）=25
    xx+x-90=0
    2(3x+4)-5(x+1)=3
    2（3x+4）-5（x+1）=3
    -1140+x-x*0.02=500
    0.65*（1-q^7）*（1-q）=6.79
    0.65*（1-q^7）/（1-q）=5.88
    4x^2+13x-162=0
    x/3+2/3x
    10x^2-4x=36
    3^x=x^9
    192*0.5*x-162*0.5*(x-15.5)^2-15*113.75*(181.2-x)
    192*0.5*x-162*0.5*(x-15.5)^2=15*113.75*(181.2-x)
    X+3÷x
    cosx÷（e＾x）
    x^2-24x+48= 0

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