1000(x-60)-150000=200000
    1000x(x-60)-150000=200000
    10*0.4=10*0.5-10*0.5x
    10x=10*0.5-2x
    10x=10*0.5-1
    10*0.4=10*0.5-5x
    10*0.4=10*0.5-0.5x
    10*0.4=10*0.5-10x
    10*0.6=10*0.5-10x
    100*(x^2)=2^x
    100*x^2=2*x
    （x-12）^2（x-18）^2=36x^3-x^4-36^2
    x^2+966x-1764=0
    39=arctan0.04w
    x²-12x-9=0
    3x²-8x-9=0
    2x^2 + 5x - 3 = 0
    39=arctan0.04w
    -141=arctan0.04w
    90=arctan12.5w-arctanw+arctan0.1w+arctan0.00166w

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