The expression is ”.
The change is
To subtract 1200 means add –1200.
(Add: )
The value of the expression is .
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”.![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=aab12d18f4d871484aeb9ae3ba0f6a25.png\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fad7109b749c956d827535d242e94ef4.png\")
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(Add: ![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=19a6989b4dfcb41ea880a93691377fbb.png\")
)![\"\"](\"http://c4anything.com/userfiles/image/steps_images/solution.JPG\")
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.