Crossword puzzle clue "difficult to solve"

Here are the possible solutions for difficult to solve clue

Answer
Clue
Relevancy
knotty
Clue
Difficult to solve
Definition
full of knots
across
Clue
Solve every clue here and you won't go down
Definition
from one side to the other
add
Clue
What you must know how to do to solve a kakuro puzzle
Solve some KenKen, say
Definition
to compute the sum of
alg
Clue
"Solve for x" subj.
''Solve for x'' subj.
algebra
Clue
"Solve for x" subject
Math class in which you might solve for x
Definition
(Arabic) a method of calculating by symbols

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