3x^3-7x^2+20x=6
    4*x^3-27*x^2+54*x-27
    4*x^3-27*x^2+2*x-1
    -x^1.5+5=0.1
    -x^1.5+5
    (8-x)*(8-2x)=24
    64*x^2=36
    64*x^2=360
    64*x*x=360
    12x²-45x-525=0
    4x^2-3x=52
    16sinx+12cosx
    4*(1-x)^2/x^2=9+3*(1-x)^2/x^2
    4*(1-x)^2/x^2=9/x^2+3*(1-x)^2/x^2
    40x十400－2.5x²=0
    sqrt（3）x-x=40
    6x^2+5x-170=0
    (40+10x)(20-x)=1400
    2x=3x
    4x^2-2x+1=0

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