If ${\left|\overline{\mathrm{c}}\right|}^2=60$ and $\overline{\mathrm{c}}\times \left(\overline{\mathrm{i}}+2\overline{\mathrm{j}}+3\overline{\mathrm{k}}\right)=\overline{0}$ then a value of $\overline{\mathrm{c}}.\left(-7\overline{\mathrm{i}}+2\overline{\mathrm{j}}+3\overline{\mathrm{k}}\right)$ is

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