(arithmetic) addition

solve (a problem); answer (a question); unravel (a riddle) / comb; untangle (hair)

untie; unravel; undo (a fastening); unwrap / dispel (doubts); clear up (a matter)

triumphant, proud / skilled

strong point / triumph / regular customer

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

regular costumer; patron

(informal) no problem

unthinkable, out of the question

practical question (problem)