## Prealgebra (7th Edition)

$x=-10$
$x-12=-45+23\rightarrow$ simplify $x-12=-22\rightarrow$ add 12 to both sides $x-12+12=-22+12\rightarrow$ simplify $x=-10$ Check the solution by plugging in the value for y and determine whether the resulting equation is true. $-10-12=-45+23\rightarrow$ simplify $-22=-22$ This is true so the solution is correct.