Answer
$x=10$
Work Step by Step
Create a table with values of x and the corresponding value of the equation. Look for an 8 in the second column.
$\underline{\ x\ }\ \ \ \underline{x+-2}$
$\ 1\ \ \ \ \ \ \ \ -1$
$\ 2\ \ \ \ \ \ \ \ \ \ \ \ \ 0$
$\ 3\ \ \ \ \ \ \ \ \ \ \ \ \ 1$
$\ 4\ \ \ \ \ \ \ \ \ \ \ \ \ 2$
$\ 5\ \ \ \ \ \ \ \ \ \ \ \ \ 3$
$\ 6\ \ \ \ \ \ \ \ \ \ \ \ \ 4$
$\ 7\ \ \ \ \ \ \ \ \ \ \ \ \ 5$
$\ 8\ \ \ \ \ \ \ \ \ \ \ \ \ 6$
$\ 9\ \ \ \ \ \ \ \ \ \ \ \ \ 7$
$10\ \ \ \ \ \ \ \ \ \ \ \ 8\longrightarrow$ solution is 10
