(x+4)/5-(x-5)=(x+3)/3-(x-2)/2
    （x-1）/3+1=2-(x-1)/5
    16/(x*sqrt(x^2+1))=0.268
    6/(5y-1)=7/3
    16/(x*sqrt(x^2+1))=0.42
    20lgx+10lg5.8=0
    6/(5y-1)=7/3
    x^4+x^2=16^2
    2.533*12x+2.355*2x = 157.012
    2.533*12x+2.355*2x=942.07
    2x+3=6
    （27-3X）X=61
    （27-3x）*x=60
    （510+X）*23000/220/20000=（320+X）*25000/220/14000
    （510+X）*23000/220*20000=（320+X）*25000/220*14000
    a+a^2=80
    （1+x）^5=1.812
    x+15=50
    x-15=50
    ex-e-2x+2=0

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