tim cac so nguyen x,y sao cho (x-3)^2+(y-7)^2+(y-7)^2=0.(4-x)^4+/y-15/=0(y+2)^2+/x+6/<_0(3x-5)^2+/x+y/<_22.(x+3)^2+/y-1/=8(x+2)^2+2.(3y-1)^2=57
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