Hello Everyone,

I'm a beginner in both Wolfram as in english (I'm from Brazil). I'm studying the first year of Engineering, and learning simple functions. I got a Wolfram Android and I don't know how to define a function like this example:

f(x) = 6x-2 (until here I done), but I want to put that x=2 or, x = something.

I've already tried put: f(x) = 6x-2 ; x = 2 put he understand two different things, and I want to show that x=2 is the variable tha f(x).

Just to remember I'm using the Android. This tool will help me to verify and see different forms to do same exercises.

Thanks