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Arithmetic Example 2

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string someText = "Hello ";
someText = someText + "World!";
someText = someText - "World";
return someText;

//returns "Hello !";
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Error formatting macro: appfire-confluence-analytics: java.lang.NullPointerException: Cannot invoke "com.atlassian.confluence.xhtml.api.MacroDefinition.getMacroId()" because "macroDefinition" is null