x^2 * d(u(x,y,z))/dx + y^2 * d(u(x,y,z))/dy + z(x+y) * d(u(x,y,z))/dz = 0x^2 * d(u(x,y,z))/dx + y^2 * d(u(x,y,z))/dy + z(x+y) * d(u(x,y,z))/dz = 0

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