5100*(x+61x/71)+7100x=5
    3x-3x^3=x^4+1
    2x-2x^3=x^4+1
    x-x^3=x^4+1
    logx3=1/3
    X/(X+30)=0.4
    X/X+30=0.4
    x^3+2x^2-x+2=0
    13*0.8-2x=4.9
    sqrt(3)x-1. 6sqrt(3)=x+1. 6
    6x-7=9x+8
    (-11/12+3/4)x(-4^2)+(-2 1/3)/3.5
    (5x+1)/2-(6x+2)/4 = 1
    5x+1/2-6x+2/4=1
    1/1+x^2=x^2-（1/3）
    2/3(x+3)=7/2(x-2)
    x+xx=100
    x=600/x-1
    X=600/x+1
    (x/8)^2+12=x

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