The expression is .
(Substitute )
(Product of two same signs is positive) \ \
(Multiply: )
(Subtract: )
The solution is .
![\"\"](\"../../../userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=801e11ec5eca081976af82556495f8ed.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0233ccaf816417de299cc700f1c02b84.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5408c44404b3787c6eef93b7ceb2d0c9.png\")
)![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f744f33f869ca92345d1295db7ce72be.png\")
(Product of two same signs is positive) \ \
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bd5400b2c842c4a375677187564e31f2.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8cdbb6709b714a3189807311da5d5b00.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2dd7e80cea6ccc291c172337081ffab6.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=12f9bfcc4991ba52d4ae90fdc6030c3c.png\")
)![\"\"](\"../../../userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=34d3ab1f3d7f5ce929426f392d505403.png\")
.