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Hint

Match out solvent: mixture of $D_2O$ and $H_2O$ that matches the SLD of the particle in solution. Performing a measurement in match out conditions means there is no scattering intensity.

$SLD_{mixture}=SLD_{D_2O}*X_{D_2O}+SLD_{H_2O}*X_{H_2O}$

$X_{D_2O}+X_{H_2O}=1$