## Convex, 27 bytes

    9´{_´f{æ*'×@@'=\_s,¿)S*}N}%

[Try it online!](http://convex.tryitonline.net/#code=OcK0e1_CtGZ7w6YqJ8OXQEAnPVxfcyzCvylTKn1OfSU&input=)

Use the following version if only a single space is required between each equation:
## Convex, 21 bytes

    9´{_´f{æ*'×@@'=\S}N}%
[Try it online!](http://convex.tryitonline.net/#code=OcK0e1_CtGZ7w6YqJ8OXQEAnPVxTfU59JQ&input=)