x^x=2^(3x+192)
    x∧3＋x∧2－225x＝1875
    （x-60）（-100x+10000）
    (x+1)*e^x=1/2
    10-2t=8-1t
    x^2=2^x
     x2-12x-4
     x*x-12x-4
    3x^5+7x^4+12x^3+x^2+x=0
    (666000-0.7*15x*0.044)/(0.3*15x+0.03*15x)=0.038
    X^2-24 x+768=0
    （-4-4t）-（6-6t）=8
    88157.67m^3-0.295m-0.1751=0
    801.67t^3+12.63t^2-1.81=0
    4899xx-1077780x-14190000=0
    Xx-220x-2633=0
    (a-80)[400-20(a-90)]=4000
    (a-80)[400-20(90-a)]=4000
    x^2-150x+1600=4000
    ex＋e－x

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