If a circle with a diagonal line through it is a symbol for no solution how you designate the case when any value satisfies the equation?

When any value satisfies the equation, you would simply state "all real numbers." There is a symbol for it, and even though it is difficult to explain, I will attempt to. It is simply an R with an extra line making it kind of look like |R, but it's connected to the furthermost left parallel line. I hope that helps!