How do you deal with tanks?

If a tank gets 1 tank item against you in lane hes a unkillable god, He can 1v1 you with no effort you can outplay him and he can still kill you just by autoattacking you to death, I mainly play top, But mainly play gangplank/Jayce, And when put against a tank its alright at first then they buy there first item then I have to sit under tower the entire game because he will oneshot me if I try farm in lane.
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