2 x - 10 - 3x + 5x = 28
    114x^5 - 514x^4 +19x^3 - 19x^2 + 8x - 10 = 0
    sin3xsin2x
    x(4-x)/(2-x)^2=2860
    6x-2x^2
    (x+2)(x-7)=3x-5
    m^2-m-1=1 m^2+2m-3>0
    m^2+2m-2=1 m^2+2m-3>0
    m^2+2m-2=1
    0.38x7一50/19+4X50/19=
    20x+18=6（2x+1）
    x^2-3x+2=1
    3X-5=4X-8
    4t^2+11t-3=0
    2xxx-3xx=-3
    2xxx-3xx=5
    2xxx-3xx=11
    2*x*x*x-3*x*x=9
    (x-3)*(x+3)*(x-6)=5
    x^2+16=【(4√5)-x】^2

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