Let's break down the situation step by step:
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Sabrina starts with 84 coins.
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She gives away 6 coins to a friend, so the remaining coins are:
\[ 84 - 6 = 78 \]
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She then puts the remaining coins (78) into 3 bags, with an equal number of coins in each bag. If we let \( c \) represent the number of coins in each bag, we can set up the equation:
\[ 3c = 78 \]
Finally, we can complete the initial equation you provided:
\[ 84 = 6 + 3c \]
So the completed equation representing this situation is:
\[ 84 = 6 + 3c \]