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We show that, for a fixed (every) $p\\in (1,\\fz),$ the divergence equation $\\mathrm{div}\\,\\mathbf{v}=f$ is solvable in $W^{1,p}_0(\\Omega)^2$ for every $f\\in L^p_0(\\Omega)$, if and only if $\\Omega$ is a John domain, if and only if the weighted Poincar\\'e inequality $$\\int_\\Omega|u(x)-u_{\\Omega}|^q\\,dx\\le C\\int_\\Omega|\\nabla u(x)|^q\\dist(x,\\partial \\Omega)^q\\,dx$$ holds for some (every) $q\\in [1,\\fz)$. 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