![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
\
The equation is ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d71fd24216bf62b33f4e7b040fd02eff.png\")
.
Observe the equation and think of the equation as a question.
\Which number plus 8 equals 13?
\The number is 5
\![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
Check:
\To check the solution, substitute ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=543d804a2e3aadefe7da99080c2fb8af.png\")
in original equation.
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a827b7a9aed5fa71bd4772f7ebdd7286.png\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=49cab695a85ce344c646005f86a9eb71.png\")
(Add: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=882b3cc77b27c8ab32405d6bfeb8dcd9.png\")
)
Compare the values, the equation is true.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
The value of .