-2x-3x=5x-14
    1.0404Y^2+13210.224Y+47770214.56=0
    x^0.85=8.3513409
    arctan0.1x-90-arctan0.25x-arctan0.2x-arctan0.05x=25
    （x+60000）/100000=1
    x+1= (2x+1)/(4*(6x+1)^(1/3) + 1)
    arctan x+arctan 0. 2*x＝π/2
    π/2+arctan0. 5*x+arctan 0. 15*x＝2*π/3
    (20-x)(100+10x)=2240
    5÷x=5÷2x-1÷6
    X/5=5 x/2-1/6
    2x/lnx
    (4-x)^2-x^2=9
    (4-x)^2-x^2=3
    X^2-(3-x)^2=1
    x(16-2x)=33
    x(16-2x)=30
    200(1+x)^2=338
    x(26-2x)=80
    100(1-x)^2=81

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