![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step1.JPG\")
The expression is x + x = x.
\Try with some positive values and check whether the equation is true.
\Substitute any positive value for x: say 1.
\1 + 1 = 1
\2 = 1 (Add: 1 + 1 = 2)
\Compare the equation, the equation is true for x = 1.![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step2.JPG\")
Substitute any other positive value for x: say 2.
\2 + 2 = 2
4 = 2 (Add: 2 + 2 = 4)
\Compare the equation, the equation is true for x = 2.
\The given equation is true for any positive value of x.
\![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step3.JPG\")
Try with some negative values and check whether the equation is true.
\Substitute any negative value for x: say ![\"\"](\"http://c4anything.com/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c7a8c800d2df7d176b09fff75181eb8f.png\")
1.
(1) + (1) = (1)
2 = 1 (Add: (1) + (1) = 2)
Compare the equation, the equation is true for x = 1.![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step4.JPG\")
Substitute any other positive value for x: say 2.
(2) + (2) = 2
4 = 2 (Add: 2 2 = 4)
Compare the equation, the equation is true for x = 2.
![\"\"](\"http://c4anything.com/userfiles/image/steps_images/step5.JPG\")
\
Substitute x = 0.
\(0) + 0 = (0)
\0 = 0 (Simplify).
Compare the equation, the equation is true for x = 0.
\The given equation is true only when x = 0.
\The equation is always true.
\![\"\"](\"http://c4anything.com/userfiles/image/steps_images/solution.JPG\")
The equation is always true.
\