x^2=1+x
    x^2+1=0
    9(a+1)=9
    2/3=10.4t+3*t^2
    2/3=12.2t+3*t^2
    6+2/3-4.8=12.2t+3*t^2
    6*2/3-4.8=12.2t+3*t^2
    16-12*x=30.4-20*x^2
    64/3-16*x=22.8-15*x^2
    （4-4cos4x）sinx-(4x-sin4x)cosx=0
    （4-4cos4x）sinx-(4x-sin4x)cosx=0
    7*28*28=108x
    (28-3x)^2-(28-4x)^2=2x
    （28-3x）*(28-3x)-(28-4x）*(28-4x)=2x
    X/135-4/340-10/500=0.00238(x+14)
    X/135-7.6/340-6/500=0.00238(x+13.6)
    (4x-5)^2=1
    x*(x+5)=37000
    π-arcsinx
    （2254+x）/254=(246+x)/246

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