Is there any way to plot an inequality of 7 variables?

Hello,

Could you please explain if there is any way to plot inequality of the form f(p,q,r,s,t,u,v) <= g(p,q,r,s,t,u,v) ? Any example will be really helpful.

Thank you

You can plot only projections onto the 3d space eventually 4d, where the fourth dimention is color.

Potentially (e.g. if your problem is a physical one) you can apply Buckingham π theorem - Wikipedia to reduce the number of Parameters (by typically at most 4).