Answer
The distance from LA to Tokyo is 5470 miles.
Work Step by Step
Let $t$ be the distance from LA to Tokyo.
The distance from NYC to London is $t-2001$.
$t+(t-2001)=8939$ $\longrightarrow$combine like terms
$2t-2001=8939$ $\longrightarrow$addition property
$2t-2001+2001=8939+2001$ $\longrightarrow$simplify
$2t=10940$ $\longrightarrow$multiplication property
$2t\div2=10940\div2$ $\longrightarrow$simplify
$m=5470$
