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How to compute $r \cdot (a+b+c)$ for random $r$ and secret value$a,b,c$ in MPC?

So is there any possible solutions? How about: have the party jointly pick a random $d$ value, and we are done. In this case, $r = d / (a + b + c)$; as long as $a+b+c \ne 0$, it will always exist (...
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