Find GC ...it is a concatenated number
N + U + M + B + E + R = GC
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This alphametic has numerous solutions. The couple I've found so far are
$1 + 3 + 4 + 5 + 6 + 8 = 27$
$1 + 4 + 5 + 6 + 7 + 9 = 32$
All other permutations of $N, U, M, B, E, R$ also work, as addition is commutative.
$14 + 21 + 13 + 2 + 5 + 18 = 73$
This is a unique solution, given these constraints and the new tag.