# Topic msg for mathematics equation

**URL:** https://discourse.nodered.org/t/topic-msg-for-mathematics-equation/11938
**Category:** General
**Created:** [7 June 2019 12:36 UTC](https://discourse.nodered.org/t/topic-msg-for-mathematics-equation/11938 "2019-06-07T12:36:43Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![knolleary](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/knolleary/32/3_2.png) [@knolleary](https://discourse.nodered.org/u/knolleary)
#### Post date: [7 June 2019 12:41 UTC](https://discourse.nodered.org/t/topic-msg-for-mathematics-equation/11938/2 "2019-06-07T12:41:42Z")

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Hi @aabbas

you asked almost exactly the same question here: [Substraction 2 msg payload by using topic](https://discourse.nodered.org/t/substraction-2-msg-payload-by-using-topic/10471) and received two replies, neither of which you have replied to.

Please read those responses and continue the discussion in that topic rather than just ask the same question again in a new topic.

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_[View the full topic](https://discourse.nodered.org/t/topic-msg-for-mathematics-equation/11938)._