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
    270=arctan0.1w+arctan0.0016w+arctan24.26w-arctan1.38w
    50÷150=x
    270=arctan0.1w+arctan0.0016w+arctan0.04w-arctan0.0023w
    42=arctan0.1w+arctan0.00166w
    （480*63-x）*0.85+504=24420.45-599
    （480*63-x）*0.85+504=24420.45
    4*x-1-cos(x)
    e^x+10*x-2
    2x＝2
    4x^2-24x+27=0

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