The expression is .
(Apply distributive property: )
(Multiply: )
(Apply commutative property of addition: a + b = b + a)
(Add: )
The simplified expression is 13x + 15.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=caabf0674de944e9fbd024ccf5b2552f.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2b4f196479c8a5bbd9b4c094c2046dad.png\")
(Apply distributive property: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2ca759e2ab6e91a6d919095b13a54a03.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d8a8bbda8c3563a5737602447cd2afc.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b89395980d54d10c9ae88398b4d1ef32.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=72c0b0e9ca711596664f95dba1ad36ad.png\")
(Apply commutative property of addition: a + b = b + a)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c213fc38ab6d64941d99b2c93805e648.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=095a2ebbb3a494db58e8c1304a983b54.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")