If f (x) = 2x + 1 and X is not equal to 1, find limf (x) (x tends to 1) and prove it by using ε - δ I don't know much about this

If f (x) = 2x + 1 and X is not equal to 1, find limf (x) (x tends to 1) and prove it by using ε - δ I don't know much about this

Limit = 2 + 1 = 3
Syndrome: Ren gei ε > 0
|2x+1-3|=2|x-1|