## Elementary Algebra

$15$
The given expression reads: $24-26-29+26+18+29-17-10$ The expression can be rearranged as: $26-26+29-29+24+18-17-10$ The first four terms can be grouped as $(26-26)$ and $(29-29)$ so that it is easy to see that they cancel out. Thus, the current expression is: $24+18-17-10$ We may then further group the terms so that they are easier to subtract: $(24-10)$ and $(18-17)$ This results in: $14+1 = 15$