The only way "q" can sound,  is if it is accompained by "u"  

★ It  has just two sounds;  "que" or "qui"  regardless of its possition on the word 

" R " has 3 different ways to be used

★ It sounds  strong like "rr" when it is at the begginning of a word regardles of the vocal that accompanies it .

★ You have to use double "RR" to emphatize the sound in the middle of words.

★ It sounds soft  "r " when it is in between of two letters (vowels or consonants).

★ It sounds soft  "r " when it is in between two vowels.

"X " has 3 different sounds  

★  Sounds like "s" if it is at the beggining of the word 

★  X  sounds like "j"  just in a few words

★  X  sounds like "Ks" on the rest of the words