100x-x^2=6400
    x(2x-3)=209
    x(2x-3)=209
    x÷200-x÷300=2
    x^3-5x+2=0
    x^3+x-10=0
    x^3+2x-3=0
    x^3-2x-3=0
    abs(2y-4)=abs(-y+3)-1
    －2sin2x+√3=0
    100x+x+200
    296x^2-2738x+1295
    296x^2-2738x+129
    (-192*x^8)-464*x^6+sqrt(x^2+3)*sqrt(3*x^2+1)*(338*x^5+288*x^3+274*x)+464*x^2+192=0
    72/（4+2）*4=x
    √3x+x=100√3
    70%X+X=3.6
    x^2-(12-6√3)x=-9
    x^2-(12-6√3）^2=-9
    3x*2x

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