Feature Request: Markdown (or something like that) which can parse and evaluate maths/algebra equation!

A new markdown like the Hammer Time thingy ( that shows the time) but this will calculate whats inside it, and probably show the equation after hovered, will be shown as 19.5 (calculated value) and will show 15+4.5 after hovered on. Apart from that we can also add variables like val will not show slider on hovered that allows client to try different values for x if used , if var is used and not provided, the equation can be shown as it is until client sets the value... This idea can be expanded further...