## Elementary Algebra

$4$
This problem only involves addition and subtraction, so we start on the left and go right according to order of operations. Using order of operations, the given expression, $19-23-14+21+14-13 ,$ simplifies to \begin{array}{l}\require{cancel} -4-14+21+14-13 \\\\= -18+21+14-13 \\\\= 3+14-13 \\\\= 17-13 \\\\= 4 .\end{array}