How to use math symbols in a right to left text properly?

Hey there
When I write a simple mathematical equation or a number(which has sign) in the middle of a right to left text in a text box(I simply set keyboard language to EN for typing expressions & numbers) it's like mathematical symbols are somehow not considered math symbols and that's weird since in word it's not that way, take the following sentence for example that means result of the 0-127 expression is -127:
حاصل عبارت 127-0 برابر 127- است.
In word I can type it just fine(for typing expressions and numbers I set keyboard language to EN) but when I type it the same way in adobe acrobat I get this:
حاصل عبارت 0-127 برابر -127 است.
copy & paste from word also doesn't do any help, so If I want to get it right I should type math expressions from right to left meaning as instance to type 0-127 I should first type 127 then - and finally 0 also should type digits of a number before typing its sign as example for typing -127 I should first type 127 then - ,now I wonder is it the way acrobat works or I'm doing something wrong.
By the way OMG o_O even when I did copy & paste my messasge from word to the text box of forum for posting, it ended up treating math parts in upper right to left paragraph the same way as acrobat I just had to write them from right to left!
Anyone has any idea?
Message was edited by: Pooria

In a word document I wrote:
حاصل عبارت 127-0 برابر 127- اسـت
Then tried printing it using "Adobe PDF" printer, in output pdf that sentence was written in right order and interestingly it was broken into three text boxes thanks for reply.

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check the below links u will get the answers for your questions
http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3860358411d1829f0000e829fbfe/content.htm
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/field_sy.htm
http://searchsap.techtarget.com/tip/1,289483,sid21_gci920484,00.html
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